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51 lines
745 B
Plaintext
51 lines
745 B
Plaintext
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (a <INT_COLUMN>, 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'),(10000,'foobar');
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INSERT INTO t1 (a,b) SELECT a, b FROM t1;
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UPDATE t1 SET a=a+100;
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SELECT * FROM t1;
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a b
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101 a
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101 a
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10100 foobar
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10100 foobar
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102 b
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102 b
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103 c
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103 c
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104 d
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104 d
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105 e
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105 e
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UPDATE t1 SET a=a-100, b=DEFAULT WHERE a>100;
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SELECT * FROM t1;
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a b
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1 NULL
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1 NULL
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10000 NULL
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10000 NULL
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2 NULL
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2 NULL
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3 NULL
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3 NULL
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4 NULL
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4 NULL
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5 NULL
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5 NULL
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UPDATE t1 SET b = 'update' WHERE a <= 4 ORDER BY b DESC, a ASC LIMIT 1;
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SELECT * FROM t1;
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a b
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1 NULL
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1 update
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10000 NULL
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10000 NULL
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2 NULL
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2 NULL
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3 NULL
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3 NULL
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4 NULL
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4 NULL
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5 NULL
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5 NULL
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DROP TABLE t1;
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