185 lines
4.4 KiB
Plaintext
185 lines
4.4 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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CREATE TABLE upsert_test (
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a INT PRIMARY KEY,
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b 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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INSERT INTO update_test SELECT a,b+1,c FROM update_test;
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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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100 | 21 | foo
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100 | 21 |
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(4 rows)
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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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100 | 21 |
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10 | 31 | bugle
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10 | 32 | bugle
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(4 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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100 | 21 |
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11 | 41 | car
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11 | 42 | car
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(4 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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-- uncorrelated sub-select:
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UPDATE update_test
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SET (b,a) = (select a,b from update_test where b = 41 and c = 'car')
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WHERE a = 100 AND b = 20;
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SELECT * FROM update_test;
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a | b | c
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-----+----+-----
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100 | 21 |
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11 | 41 | car
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11 | 42 | car
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41 | 11 |
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(4 rows)
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-- correlated sub-select:
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UPDATE update_test o
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SET (b,a) = (select a+1,b from update_test i
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where i.a=o.a and i.b=o.b and i.c is not distinct from o.c);
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SELECT * FROM update_test;
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a | b | c
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----+-----+-----
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21 | 101 |
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41 | 12 | car
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42 | 12 | car
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11 | 42 |
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(4 rows)
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-- fail, multiple rows supplied:
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UPDATE update_test SET (b,a) = (select a+1,b from update_test);
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ERROR: more than one row returned by a subquery used as an expression
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-- set to null if no rows supplied:
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UPDATE update_test SET (b,a) = (select a+1,b from update_test where a = 1000)
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WHERE a = 11;
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SELECT * FROM update_test;
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a | b | c
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----+-----+-----
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21 | 101 |
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41 | 12 | car
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42 | 12 | car
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(4 rows)
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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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-- Make sure that we can update to a TOASTed value.
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UPDATE update_test SET c = repeat('x', 10000) WHERE c = 'car';
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SELECT a, b, char_length(c) FROM update_test;
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a | b | char_length
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----+-----+-------------
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21 | 101 |
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41 | 12 | 10000
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42 | 12 | 10000
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(4 rows)
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-- Test ON CONFLICT DO UPDATE
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INSERT INTO upsert_test VALUES(1, 'Boo');
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-- uncorrelated sub-select:
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WITH aaa AS (SELECT 1 AS a, 'Foo' AS b) INSERT INTO upsert_test
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VALUES (1, 'Bar') ON CONFLICT(a)
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DO UPDATE SET (b, a) = (SELECT b, a FROM aaa) RETURNING *;
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a | b
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---+-----
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1 | Foo
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(1 row)
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-- correlated sub-select:
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INSERT INTO upsert_test VALUES (1, 'Baz') ON CONFLICT(a)
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DO UPDATE SET (b, a) = (SELECT b || ', Correlated', a from upsert_test i WHERE i.a = upsert_test.a)
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RETURNING *;
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a | b
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---+-----------------
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1 | Foo, Correlated
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(1 row)
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-- correlated sub-select (EXCLUDED.* alias):
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INSERT INTO upsert_test VALUES (1, 'Bat') ON CONFLICT(a)
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DO UPDATE SET (b, a) = (SELECT b || ', Excluded', a from upsert_test i WHERE i.a = excluded.a)
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RETURNING *;
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a | b
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---+---------------------------
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1 | Foo, Correlated, Excluded
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(1 row)
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DROP TABLE update_test;
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DROP TABLE upsert_test;
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