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@ -2,12 +2,12 @@ |
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-- JOIN |
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-- Test join clauses |
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-- |
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CREATE TABLE JOIN1_TBL ( |
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CREATE TABLE J1_TBL ( |
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i integer, |
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j integer, |
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t text |
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); |
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CREATE TABLE JOIN2_TBL ( |
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CREATE TABLE J2_TBL ( |
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i integer, |
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k integer |
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); |
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@ -20,21 +20,99 @@ CREATE TABLE JOIN4_TBL ( |
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k integer, |
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z integer |
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); |
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INSERT INTO JOIN1_TBL VALUES (1, 3, 'one'); |
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INSERT INTO JOIN1_TBL VALUES (2, 2, 'two'); |
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INSERT INTO JOIN1_TBL VALUES (3, 1, 'three'); |
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INSERT INTO JOIN1_TBL VALUES (4, 0, 'four'); |
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INSERT INTO JOIN2_TBL VALUES (1, -1); |
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INSERT INTO JOIN2_TBL VALUES (2, 2); |
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INSERT INTO JOIN2_TBL VALUES (3, -3); |
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INSERT INTO JOIN2_TBL VALUES (2, 4); |
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INSERT INTO J1_TBL VALUES (1, 3, 'one'); |
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INSERT INTO J1_TBL VALUES (2, 2, 'two'); |
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INSERT INTO J1_TBL VALUES (3, 1, 'three'); |
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INSERT INTO J1_TBL VALUES (4, 0, 'four'); |
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INSERT INTO J2_TBL VALUES (1, -1); |
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INSERT INTO J2_TBL VALUES (2, 2); |
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INSERT INTO J2_TBL VALUES (3, -3); |
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INSERT INTO J2_TBL VALUES (2, 4); |
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-- |
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-- CORRELATION NAMES |
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-- Make sure that table/column aliases are supported |
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-- before diving into more complex join syntax. |
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-- |
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SELECT '' AS "xxx", * |
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FROM J1_TBL AS tx; |
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xxx | i | j | t |
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-----+---+---+------- |
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| 1 | 3 | one |
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| 2 | 2 | two |
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| 3 | 1 | three |
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| 4 | 0 | four |
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(4 rows) |
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SELECT '' AS "xxx", * |
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FROM J1_TBL tx; |
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xxx | i | j | t |
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-----+---+---+------- |
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| 1 | 3 | one |
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| 2 | 2 | two |
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| 3 | 1 | three |
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| 4 | 0 | four |
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(4 rows) |
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SELECT '' AS "xxx", * |
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FROM J1_TBL AS t1 (a, b, c); |
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xxx | a | b | c |
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-----+---+---+------- |
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| 1 | 3 | one |
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| 2 | 2 | two |
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| 3 | 1 | three |
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| 4 | 0 | four |
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(4 rows) |
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SELECT '' AS "xxx", * |
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FROM J1_TBL t1 (a, b, c); |
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xxx | a | b | c |
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-----+---+---+------- |
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| 1 | 3 | one |
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| 2 | 2 | two |
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| 3 | 1 | three |
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| 4 | 0 | four |
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(4 rows) |
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SELECT '' AS "xxx", * |
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FROM J1_TBL t1 (a, b, c), J2_TBL t2 (d, e); |
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xxx | a | b | c | d | e |
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-----+---+---+-------+---+---- |
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| 1 | 3 | one | 1 | -1 |
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| 2 | 2 | two | 1 | -1 |
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| 3 | 1 | three | 1 | -1 |
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| 4 | 0 | four | 1 | -1 |
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| 1 | 3 | one | 2 | 2 |
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| 2 | 2 | two | 2 | 2 |
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| 3 | 1 | three | 2 | 2 |
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| 4 | 0 | four | 2 | 2 |
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| 1 | 3 | one | 3 | -3 |
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| 2 | 2 | two | 3 | -3 |
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| 3 | 1 | three | 3 | -3 |
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| 4 | 0 | four | 3 | -3 |
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| 1 | 3 | one | 2 | 4 |
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| 2 | 2 | two | 2 | 4 |
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| 3 | 1 | three | 2 | 4 |
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| 4 | 0 | four | 2 | 4 |
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(16 rows) |
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SELECT '' AS "xxx", t1.a, t2.e |
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FROM J1_TBL t1 (a, b, c), J2_TBL t2 (d, e) |
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WHERE t1.a = t2.d; |
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xxx | a | e |
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-----+---+---- |
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| 1 | -1 |
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| 2 | 2 |
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| 2 | 4 |
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| 3 | -3 |
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(4 rows) |
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-- |
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-- CROSS JOIN |
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-- Qualifications are not allowed on cross joins, |
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-- which degenerate into a standard unqualified inner join. |
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-- |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL CROSS JOIN JOIN2_TBL; |
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FROM J1_TBL CROSS JOIN J2_TBL; |
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xxx | i | j | t | i | k |
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-----+---+---+-------+---+---- |
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| 1 | 3 | one | 1 | -1 |
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@ -55,15 +133,41 @@ SELECT '' AS "xxx", * |
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| 4 | 0 | four | 2 | 4 |
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(16 rows) |
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-- ambiguous column |
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SELECT '' AS "xxx", i, k, t |
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FROM JOIN1_TBL CROSS JOIN JOIN2_TBL; |
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FROM J1_TBL CROSS JOIN J2_TBL; |
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ERROR: Column 'i' is ambiguous |
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-- resolve previous ambiguity by specifying the table name |
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SELECT '' AS "xxx", t1.i, k, t |
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FROM J1_TBL t1 CROSS JOIN J2_TBL t2; |
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xxx | i | k | t |
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-----+---+----+------- |
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| 1 | -1 | one |
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| 2 | -1 | two |
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| 3 | -1 | three |
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| 4 | -1 | four |
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| 1 | 2 | one |
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| 2 | 2 | two |
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| 3 | 2 | three |
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| 4 | 2 | four |
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| 1 | -3 | one |
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| 2 | -3 | two |
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| 3 | -3 | three |
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| 4 | -3 | four |
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| 1 | 4 | one |
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| 2 | 4 | two |
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| 3 | 4 | three |
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| 4 | 4 | four |
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(16 rows) |
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SELECT '' AS "xxx", ii, tt, kk |
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FROM JOIN1_TBL CROSS JOIN JOIN2_TBL AS JT (ii, jj, tt, ii2, kk); |
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ERROR: parser: parse error at or near "(" |
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SELECT '' AS "xxx", jt.ii, jt.jj, jt.kk |
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FROM JOIN1_TBL CROSS JOIN JOIN2_TBL AS JT (ii, jj, tt, ii2, kk); |
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ERROR: parser: parse error at or near "(" |
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FROM (J1_TBL CROSS JOIN J2_TBL) |
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AS tx (ii, jj, tt, ii2, kk); |
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ERROR: JOIN table aliases are not supported |
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SELECT '' AS "xxx", tx.ii, tx.jj, tx.kk |
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FROM (J1_TBL t1 (a, b, c) CROSS JOIN J2_TBL t2 (d, e)) |
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AS tx (ii, jj, tt, ii2, kk); |
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ERROR: JOIN table aliases are not supported |
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-- |
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-- |
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-- Inner joins (equi-joins) |
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@ -74,29 +178,108 @@ ERROR: parser: parse error at or near "(" |
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-- The USING syntax changes the shape of the resulting table |
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-- by including a column in the USING clause only once in the result. |
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-- |
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-- Inner equi-join on all columns with the same name |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL NATURAL JOIN JOIN2_TBL; |
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ERROR: JOIN expressions are not yet implemented |
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-- Inner equi-join on specified column |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL INNER JOIN JOIN2_TBL USING (i); |
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ERROR: JOIN expressions are not yet implemented |
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FROM J1_TBL INNER JOIN J2_TBL USING (i); |
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xxx | i | j | t | k |
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-----+---+---+-------+---- |
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| 1 | 3 | one | -1 |
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| 2 | 2 | two | 2 |
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| 2 | 2 | two | 4 |
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| 3 | 1 | three | -3 |
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(4 rows) |
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-- Same as above, slightly different syntax |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL JOIN JOIN2_TBL USING (i); |
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ERROR: JOIN expressions are not yet implemented |
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FROM J1_TBL JOIN J2_TBL USING (i); |
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xxx | i | j | t | k |
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-----+---+---+-------+---- |
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| 1 | 3 | one | -1 |
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| 2 | 2 | two | 2 |
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| 2 | 2 | two | 4 |
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| 3 | 1 | three | -3 |
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(4 rows) |
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SELECT '' AS "xxx", * |
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FROM J1_TBL t1 (a, b, c) JOIN J2_TBL t2 (a, d) USING (a); |
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xxx | a | b | c | d |
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-----+---+---+-------+---- |
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| 1 | 3 | one | -1 |
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| 2 | 2 | two | 2 |
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| 2 | 2 | two | 4 |
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| 3 | 1 | three | -3 |
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(4 rows) |
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SELECT '' AS "xxx", * |
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FROM J1_TBL t1 (a, b, c) JOIN J2_TBL t2 (a, b) USING (b); |
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xxx | b | a | c | a |
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-----+---+---+-----+--- |
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| 2 | 2 | two | 2 |
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(1 row) |
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-- |
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-- NATURAL JOIN |
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-- Inner equi-join on all columns with the same name |
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-- |
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SELECT '' AS "xxx", * |
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FROM J1_TBL NATURAL JOIN J2_TBL; |
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xxx | i | j | t | k |
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-----+---+---+-------+---- |
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| 1 | 3 | one | -1 |
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| 2 | 2 | two | 2 |
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| 2 | 2 | two | 4 |
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| 3 | 1 | three | -3 |
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(4 rows) |
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SELECT '' AS "xxx", * |
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FROM J1_TBL t1 (a, b, c) NATURAL JOIN J2_TBL t2 (a, d); |
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xxx | a | b | c | d |
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-----+---+---+-------+---- |
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| 1 | 3 | one | -1 |
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| 2 | 2 | two | 2 |
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| 2 | 2 | two | 4 |
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| 3 | 1 | three | -3 |
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(4 rows) |
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SELECT '' AS "xxx", * |
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FROM J1_TBL t1 (a, b, c) NATURAL JOIN J2_TBL t2 (d, a); |
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xxx | a | b | c | d |
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-----+---+---+------+--- |
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| 2 | 2 | two | 2 |
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| 4 | 0 | four | 2 |
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(2 rows) |
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SELECT '' AS "xxx", * |
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FROM J1_TBL t1 (a, b, c) NATURAL JOIN J2_TBL t2 (d, a); |
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xxx | a | b | c | d |
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-----+---+---+------+--- |
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| 2 | 2 | two | 2 |
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| 4 | 0 | four | 2 |
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(2 rows) |
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-- mismatch number of columns |
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-- currently, Postgres will fill in with underlying names |
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SELECT '' AS "xxx", * |
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FROM J1_TBL t1 (a, b) NATURAL JOIN J2_TBL t2 (a); |
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xxx | a | b | t | k |
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-----+---+---+-------+---- |
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| 1 | 3 | one | -1 |
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| 2 | 2 | two | 2 |
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| 2 | 2 | two | 4 |
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| 3 | 1 | three | -3 |
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(4 rows) |
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-- |
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-- Inner joins (equi-joins) |
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-- |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL JOIN JOIN2_TBL ON (JOIN1_TBL.i = JOIN2_TBL.i); |
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ERROR: JOIN expressions are not yet implemented |
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FROM J1_TBL JOIN J2_TBL ON (J1_TBL.i = J2_TBL.i); |
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ERROR: transformExpr: does not know how to transform node 501 (internal error) |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL JOIN JOIN2_TBL ON (JOIN1_TBL.i = JOIN2_TBL.k); |
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ERROR: JOIN expressions are not yet implemented |
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FROM J1_TBL JOIN J2_TBL ON (J1_TBL.i = J2_TBL.k); |
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ERROR: transformExpr: does not know how to transform node 501 (internal error) |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL CROSS JOIN JOIN2_TBL; |
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FROM J1_TBL CROSS JOIN J2_TBL; |
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xxx | i | j | t | i | k |
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-----+---+---+-------+---+---- |
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| 1 | 3 | one | 1 | -1 |
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@ -121,32 +304,28 @@ SELECT '' AS "xxx", * |
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-- Non-equi-joins |
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-- |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL JOIN JOIN2_TBL ON (JOIN1_TBL.i <= JOIN2_TBL.k); |
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ERROR: JOIN expressions are not yet implemented |
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FROM J1_TBL JOIN J2_TBL ON (J1_TBL.i <= J2_TBL.k); |
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ERROR: transformExpr: does not know how to transform node 501 (internal error) |
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-- |
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-- Outer joins |
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-- |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL OUTER JOIN JOIN2_TBL USING (i); |
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NOTICE: OUTER JOIN not yet implemented |
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ERROR: JOIN expressions are not yet implemented |
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FROM J1_TBL OUTER JOIN J2_TBL USING (i); |
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ERROR: OUTER JOIN is not yet supported |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL LEFT OUTER JOIN JOIN2_TBL USING (i); |
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NOTICE: LEFT OUTER JOIN not yet implemented |
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ERROR: JOIN expressions are not yet implemented |
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FROM J1_TBL LEFT OUTER JOIN J2_TBL USING (i); |
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ERROR: OUTER JOIN is not yet supported |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL RIGHT OUTER JOIN JOIN2_TBL USING (i); |
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NOTICE: RIGHT OUTER JOIN not yet implemented |
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ERROR: JOIN expressions are not yet implemented |
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FROM J1_TBL RIGHT OUTER JOIN J2_TBL USING (i); |
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ERROR: OUTER JOIN is not yet supported |
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SELECT '' AS "xxx", * |
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FROM JOIN1_TBL FULL OUTER JOIN JOIN2_TBL USING (i); |
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NOTICE: FULL OUTER JOIN not yet implemented |
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ERROR: JOIN expressions are not yet implemented |
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FROM J1_TBL FULL OUTER JOIN J2_TBL USING (i); |
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ERROR: OUTER JOIN is not yet supported |
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-- |
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-- More complicated constructs |
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-- |
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-- |
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-- Clean up |
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-- |
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DROP TABLE JOIN1_TBL; |
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DROP TABLE JOIN2_TBL; |
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DROP TABLE J1_TBL; |
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DROP TABLE J2_TBL; |
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Thomas G. Lockhart
26 years ago