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30 lines
592 B
MySQL
30 lines
592 B
MySQL
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DROP TABLE IF EXISTS a;
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DROP TABLE IF EXISTS b;
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DROP TABLE IF EXISTS c;
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CREATE TABLE a (x UInt64) ENGINE = Memory;
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CREATE TABLE b (x UInt64) ENGINE = Memory;
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CREATE TABLE c (x UInt64) ENGINE = Memory;
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SET enable_optimize_predicate_expression = 0;
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SELECT a.x AS x FROM a
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LEFT JOIN b ON a.x = b.x
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LEFT JOIN c ON a.x = c.x;
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SELECT a.x AS x FROM a
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LEFT JOIN b ON a.x = b.x
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LEFT JOIN c ON b.x = c.x;
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SELECT b.x AS x FROM a
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LEFT JOIN b ON a.x = b.x
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LEFT JOIN c ON b.x = c.x;
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SELECT c.x AS x FROM a
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LEFT JOIN b ON a.x = b.x
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LEFT JOIN c ON b.x = c.x;
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DROP TABLE a;
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DROP TABLE b;
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DROP TABLE c;
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