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12 lines
329 B
Text
12 lines
329 B
Text
CREATE TABLE t1 (
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id int NOT NULL AUTO_INCREMENT,
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a int NOT NULL,
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b int NOT NULL,
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PRIMARY KEY (id),
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UNIQUE KEY ba (b, a)
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) ENGINE=InnoDB;
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INSERT INTO t1 (a, b) VALUES(1,101),(1,102),(1,103),(1,104),(1,105),(1,106),(1,107),(1,108),(1,109),(1,110);
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SELECT COUNT(DISTINCT b) FROM t1 WHERE a = 1;
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COUNT(DISTINCT b)
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10
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DROP TABLE t1;
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