29 lines
1.6 KiB
SQL
29 lines
1.6 KiB
SQL
##
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# distinct 下压(有才limit 下压)
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select c1 from t1 union select c2 from t2;
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# 下压
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select c1 from t1 union select c2 from t2 limit 2;
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select c1 from t1 minus select c2 from t2 limit 2;
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select c1 from t1 limit 2 union select c2 from t2;
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# limit 下压(只有union all下压)
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select c1 from t1 union all select c2 from t2 limit 2;
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select c1 from t1 limit 5 union all select c2 from t2 limit 2;
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select c1 from t1 intersect select c2 from t2 limit 2;
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# order by 下压
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select c1 from t1 union all select c2 from t2 order by c1;
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select c1 from t1 union all select c2 from t2 order by c1 limit 2;
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select c1, c2 from t1 order by c2 union all select c1, c2 from t2 order by c1 limit 2;
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select c1, c2 from t1 limit 5 union all select c1, c2 from t2 order by c1 limit 2;
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select c1 from t1 minus select c2 from t2 order by c1 limit 2;
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## complex test
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select * from v limit 10 union select * from v limit 10 union select * from v limit 10 union select * from v limit 10 union select * from v limit 10 union select * from v order by c1 limit 10;
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select * from v order by c1 union select * from v order by c1 union select * from v order by c1 union select * from v order by c1 union select * from v order by c1 union select * from v order by c1 limit 10;
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select * from v order by c1 union all select * from v order by c1 union all select * from v order by c1 union all select * from v order by c1 union all select * from v order by c1 union select * from v order by c1 limit 10;
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(select c2 from t1 order by c2 intersect select * from v order by c2 limit 10)union (select c1 from t1 minus select * from v order by c1 limit 11) order by c2 limit 3;
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