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038db406c1
* multi-table updates * new paid feature for limiting number of queries per hour for users * optional syntax for multi-table deletes * optimization for SQL_CALC_FOUND_ROWS * a small addition for CREATE .. SELECT that will be of future use I know that all this will require many additions to documentation, which I have not done, but I am at Arjen's disposal to help him document all this.
41 lines
1.2 KiB
Text
41 lines
1.2 KiB
Text
drop table if exists t1,t2,t3;
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create table t1(id1 int not null auto_increment primary key, t char(12));
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create table t2(id2 int not null, t char(12));
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create table t3(id3 int not null, t char(12), index(id3));
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update t1,t2,t3 set t1.t="aaa", t2.t="bbb", t3.t="cc" where t1.id1 = t2.id2 and t2.id2 = t3.id3 and t1.id1 > 90;
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delete t1.*, t2.*, t3.* from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3 and t1.id1 > 95;
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check table t1, t2, t3;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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test.t2 check status OK
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test.t3 check status OK
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select count(*) from t1 where id1 > 95;
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count(*)
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0
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select count(*) from t2 where id2 > 95;
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count(*)
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0
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select count(*) from t3 where id3 > 95;
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count(*)
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0
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delete t1, t2, t3 from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3 and t1.id1 > 5;
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select count(*) from t1 where id1 > 5;
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count(*)
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0
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select count(*) from t2 where id2 > 5;
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count(*)
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0
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select count(*) from t3 where id3 > 5;
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count(*)
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0
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delete from t1, t2, t3 using t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3 and t1.id1 > 0;
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select count(*) from t1 where id1;
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count(*)
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0
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select count(*) from t2 where id2;
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count(*)
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0
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select count(*) from t3 where id3;
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count(*)
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0
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drop table t1,t2,t3;
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