16 lines
299 B
SQL
16 lines
299 B
SQL
CREATE TABLE t1(a INT, b INT);
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CREATE TABLE t2(c INT, d INT);
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CREATE TABLE t3(e TEXT, f TEXT);
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INSERT INTO t1 VALUES('x',1);
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INSERT INTO t2 VALUES(1,2);
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SELECT *
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FROM t1, t2
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LEFT JOIN t3 ON (t2.d=1)
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WHERE t2.c = +t1.a;
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SELECT *
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FROM t1
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LEFT JOIN t2 ON (t2.c=+t1.a)
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LEFT JOIN t3 ON (t2.d IS NULL); |