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49 lines
1.9 KiB
49 lines
1.9 KiB
3 months ago
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select 1+1,1-1,1+1*2,8/5,8%5,mod(8,5),mod(8,5)|0,-(1+1)*-2;
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1+1 1-1 1+1*2 8/5 8%5 mod(8,5) mod(8,5)|0 -(1+1)*-2
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2 0 3 1.6000 3 3 3 4
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explain select 1+1,1-1,1+1*2,8/5,8%5,mod(8,5),mod(8,5)|0,-(1+1)*-2;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 /* select#1 */ select (1 + 1) AS `1+1`,(1 - 1) AS `1-1`,(1 + (1 * 2)) AS `1+1*2`,(8 / 5) AS `8/5`,(8 % 5) AS `8%5`,(8 % 5) AS `mod(8,5)`,((8 % 5) | 0) AS `mod(8,5)|0`,(-((1 + 1)) * -(2)) AS `-(1+1)*-2`
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select 1 | (1+1),5 & 3,bit_count(7) ;
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1 | (1+1) 5 & 3 bit_count(7)
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3 1 3
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explain select 1 | (1+1),5 & 3,bit_count(7) ;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 /* select#1 */ select (1 | (1 + 1)) AS `1 | (1+1)`,(5 & 3) AS `5 & 3`,bit_count(7) AS `bit_count(7)`
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select 1 << 32,1 << 63, 1 << 64, 4 >> 2, 4 >> 63, 1<< 63 >> 60;
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1 << 32 1 << 63 1 << 64 4 >> 2 4 >> 63 1<< 63 >> 60
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4294967296 9223372036854775808 0 1 0 8
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select -1 | 0, -1 ^ 0, -1 & 0;
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-1 | 0 -1 ^ 0 -1 & 0
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18446744073709551615 18446744073709551615 0
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select -1 | 1, -1 ^ 1, -1 & 1;
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-1 | 1 -1 ^ 1 -1 & 1
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18446744073709551615 18446744073709551614 1
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select 1 | -1, 1 ^ -1, 1 & -1;
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1 | -1 1 ^ -1 1 & -1
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18446744073709551615 18446744073709551614 1
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select 0 | -1, 0 ^ -1, 0 & -1;
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0 | -1 0 ^ -1 0 & -1
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18446744073709551615 18446744073709551615 0
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select -1 >> 0, -1 << 0;
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-1 >> 0 -1 << 0
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18446744073709551615 18446744073709551615
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select -1 >> 1, -1 << 1;
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-1 >> 1 -1 << 1
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9223372036854775807 18446744073709551614
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drop table if exists t1,t2;
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create table t1(a int);
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create table t2(a int, b int);
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insert into t1 values (1), (2), (3);
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insert into t2 values (1, 7), (3, 7);
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select t1.a, t2.a, t2.b, bit_count(t2.b) from t1 left join t2 on t1.a=t2.a;
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a a b bit_count(t2.b)
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1 1 7 3
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2 NULL NULL NULL
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3 3 7 3
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drop table t1, t2;
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