91 lines
2.2 KiB
Plaintext
91 lines
2.2 KiB
Plaintext
--
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-- UPDATE syntax tests
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--
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CREATE TABLE update_test (
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a INT DEFAULT 10,
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b INT,
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c TEXT
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);
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INSERT INTO update_test VALUES (5, 10, 'foo');
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INSERT INTO update_test(b, a) VALUES (15, 10);
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SELECT * FROM update_test;
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a | b | c
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----+----+-----
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5 | 10 | foo
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10 | 15 |
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(2 rows)
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UPDATE update_test SET a = DEFAULT, b = DEFAULT;
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SELECT * FROM update_test;
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a | b | c
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----+---+-----
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10 | | foo
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10 | |
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(2 rows)
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-- aliases for the UPDATE target table
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UPDATE update_test AS t SET b = 10 WHERE t.a = 10;
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SELECT * FROM update_test;
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a | b | c
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----+----+-----
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10 | 10 | foo
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10 | 10 |
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(2 rows)
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UPDATE update_test t SET b = t.b + 10 WHERE t.a = 10;
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SELECT * FROM update_test;
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a | b | c
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----+----+-----
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10 | 20 | foo
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10 | 20 |
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(2 rows)
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--
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-- Test VALUES in FROM
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--
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UPDATE update_test SET a=v.i FROM (VALUES(100, 20)) AS v(i, j)
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WHERE update_test.b = v.j;
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SELECT * FROM update_test;
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a | b | c
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-----+----+-----
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100 | 20 | foo
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100 | 20 |
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(2 rows)
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--
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-- Test multiple-set-clause syntax
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--
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UPDATE update_test SET (c,b,a) = ('bugle', b+11, DEFAULT) WHERE c = 'foo';
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SELECT * FROM update_test;
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a | b | c
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-----+----+-------
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100 | 20 |
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10 | 31 | bugle
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(2 rows)
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UPDATE update_test SET (c,b) = ('car', a+b), a = a + 1 WHERE a = 10;
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SELECT * FROM update_test;
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a | b | c
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-----+----+-----
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100 | 20 |
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11 | 41 | car
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(2 rows)
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-- fail, multi assignment to same column:
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UPDATE update_test SET (c,b) = ('car', a+b), b = a + 1 WHERE a = 10;
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ERROR: multiple assignments to same column "b"
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-- XXX this should work, but doesn't yet:
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UPDATE update_test SET (a,b) = (select a,b FROM update_test where c = 'foo')
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WHERE a = 10;
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ERROR: syntax error at or near "select"
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LINE 1: UPDATE update_test SET (a,b) = (select a,b FROM update_test ...
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^
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-- if an alias for the target table is specified, don't allow references
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-- to the original table name
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UPDATE update_test AS t SET b = update_test.b + 10 WHERE t.a = 10;
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ERROR: invalid reference to FROM-clause entry for table "update_test"
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LINE 1: UPDATE update_test AS t SET b = update_test.b + 10 WHERE t.a...
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^
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HINT: Perhaps you meant to reference the table alias "t".
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DROP TABLE update_test;
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