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38 lines
1 KiB
Text
38 lines
1 KiB
Text
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>, <CUSTOM_INDEX> (b)) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
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INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e'),(6,'x'),(7,'y'),(8,'z');
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DELETE FROM t1 WHERE b > 'y';
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DELETE FROM t1 WHERE a=2;
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SELECT * FROM t1;
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a b
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1 a
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3 c
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4 d
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5 e
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6 x
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7 y
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DELETE FROM t1;
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DROP TABLE t1;
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CREATE TABLE t1 (a <INT_COLUMN> PRIMARY KEY, b <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
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INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e'),(6,'x'),(7,'y'),(8,'z');
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DELETE FROM t1 WHERE b > 'y';
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DELETE FROM t1 WHERE a=2;
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SELECT * FROM t1;
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a b
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1 a
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3 c
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4 d
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5 e
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6 x
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7 y
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DELETE FROM t1;
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DROP TABLE t1;
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CREATE TABLE t1 (a <INT_COLUMN>, b <INT_COLUMN>, c <INT_COLUMN>, <CUSTOM_INDEX>(a), <CUSTOM_INDEX>(b)) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
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INSERT INTO t1 (a,b,c) VALUES (1,2,3),(4,5,6),(7,8,9);
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DELETE FROM t1 WHERE a = 10 OR b = 20 ORDER BY c LIMIT 1;
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SELECT * FROM t1;
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a b c
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1 2 3
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4 5 6
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7 8 9
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DROP TABLE t1;
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