72 lines
2.0 KiB
MySQL
72 lines
2.0 KiB
MySQL
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--
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-- Subselects
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--
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SELECT 1 AS one WHERE 1 IN (SELECT 1);
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SELECT 1 AS zero WHERE 1 NOT IN (SELECT 1);
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SELECT 1 AS zero WHERE 1 IN (SELECT 2);
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-- Set up some simple test tables
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CREATE TABLE SUBSELECT_TBL (
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f1 integer,
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f2 integer,
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f3 float
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);
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INSERT INTO SUBSELECT_TBL VALUES (1, 2, 3);
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INSERT INTO SUBSELECT_TBL VALUES (2, 3, 4);
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INSERT INTO SUBSELECT_TBL VALUES (3, 4, 5);
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INSERT INTO SUBSELECT_TBL VALUES (1, 1, 1);
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INSERT INTO SUBSELECT_TBL VALUES (2, 2, 2);
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INSERT INTO SUBSELECT_TBL VALUES (3, 3, 3);
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INSERT INTO SUBSELECT_TBL VALUES (6, 7, 8);
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INSERT INTO SUBSELECT_TBL VALUES (8, 9, NULL);
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SELECT '' AS eight, * FROM SUBSELECT_TBL;
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-- Uncorrelated subselects
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SELECT '' AS two, f1 AS "Constant Select" FROM SUBSELECT_TBL
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WHERE f1 IN (SELECT 1);
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SELECT '' AS six, f1 AS "Uncorrelated Field" FROM SUBSELECT_TBL
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WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL);
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SELECT '' AS six, f1 AS "Uncorrelated Field" FROM SUBSELECT_TBL
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WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL WHERE
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f2 IN (SELECT f1 FROM SUBSELECT_TBL));
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-- Correlated subselects
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SELECT '' AS six, f1 AS "Correlated Field", f3 AS "Second Field"
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FROM SUBSELECT_TBL
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WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL WHERE f2 = f1);
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SELECT '' AS six, f1 AS "Correlated Field", f3 AS "Second Field"
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FROM SUBSELECT_TBL
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WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL WHERE CAST(f2 AS float) = f3);
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SELECT '' AS six, f1 AS "Correlated Field", f3 AS "Second Field"
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FROM SUBSELECT_TBL
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WHERE f1 IN (SELECT f2 FROM SUBSELECT_TBL WHERE f2 = CAST(f3 AS integer));
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SELECT '' AS five, f1 AS "Correlated Field"
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FROM SUBSELECT_TBL
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WHERE (f1, f2) IN (SELECT f2, CAST(f3 AS int4) FROM SUBSELECT_TBL WHERE f3 IS NOT NULL);
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SELECT '' AS three, f1 AS "Correlated Field"
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FROM SUBSELECT_TBL
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WHERE (f1, f2) NOT IN (SELECT f2, CAST(f3 AS int4) FROM SUBSELECT_TBL WHERE f3 IS NOT NULL);
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--
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-- Use some existing tables in the regression test
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--
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SELECT '' AS eight, ss.f1 AS "Correlated Field", ss.f3 AS "Second Field"
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FROM SUBSELECT_TBL ss
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WHERE f1 NOT IN (SELECT f1 FROM INT4_TBL WHERE f1 != ss.f1);
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