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091fe03775
of the syntax as this fundamentally dead-end approach can, in particular combinations of single and multi column assignments. Improve rather inadequate documentation and provide some regression tests.
60 lines
1.4 KiB
PL/PgSQL
60 lines
1.4 KiB
PL/PgSQL
--
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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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UPDATE update_test SET a = DEFAULT, b = DEFAULT;
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SELECT * FROM update_test;
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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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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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--
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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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--
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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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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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-- 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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-- 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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-- 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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BEGIN;
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SET LOCAL add_missing_from = false;
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UPDATE update_test AS t SET b = update_test.b + 10 WHERE t.a = 10;
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ROLLBACK;
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DROP TABLE update_test;
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