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15 lines
340 B
Plaintext
15 lines
340 B
Plaintext
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CREATE TABLE t1(x, y);
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INSERT INTO t1 VALUES(1, NULL);
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INSERT INTO t1 VALUES(2, NULL);
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INSERT INTO t1 VALUES(1, NULL);
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SELECT DISTINCT x, y FROM t1 ;
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CREATE UNIQUE INDEX i1 ON t1(x, y) ;
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SELECT DISTINCT x, y FROM t1 ;
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CREATE TABLE t2(x, y NOT NULL);
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CREATE UNIQUE INDEX t2x ON t2(x);
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CREATE UNIQUE INDEX t2y ON t2(y);
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