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15 lines
540 B
Plaintext
15 lines
540 B
Plaintext
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (c1 VARCHAR(255), c2 VARCHAR(255), c3 INT);
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INSERT INTO t1 VALUES (REPEAT('x', 255), REPEAT('y', 255), 1);
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INSERT INTO t1 VALUES (REPEAT('x', 255), REPEAT('y', 255), 2);
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INSERT INTO t1 VALUES (REPEAT('x', 255), REPEAT('y', 255), 3);
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SELECT COUNT(*) FROM t1;
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COUNT(*)
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3
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drop table if exists t1;
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create table t1 (a int, unique index indexa (a));
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insert into t1 values (-1), (-4), (-2), (NULL);
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select -10 IN (select a from t1 FORCE INDEX (indexa));
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-10 IN (select a from t1 FORCE INDEX (indexa))
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NULL
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