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¼, C4 £;»  ¡ª Ö ö» äü Ü Ó Ã ááá ° Ï Ò µ %µ cäc1, c2, c3 ² ¿· Ö
A where c1 = x and c2 = x and c4> x and c3 = x
B where c1 = x and c2 = x and c4 = x order by c3
C where c1 = x and c4 = x group by c3, c2
D where c1 =? And c5 =? Order by c2, c3
E where c1 =? And c2 =? And c5 =? Order by c2, c3
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OK?
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insert into t values('a1','a2','a3','a4','a5'),('b1','b2','b3','b4','b5');
2. ~~~~~~~£°
insert into t values('a1','a2','a3','a4','a5'),('b1','b2','b3','b4','b5');
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alter table t add index c1234(c1,c2,c3,c4);
Please refer to the following documents for more information:
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