比如where (column1,column2) in ((a1,b1),(a2,b2),(a3,b3)) 实例 建表 create table t_demo( id int NOT NULL AUTO_INCREMENT PRIMARY KEY, name varchar(10), score int ); insert into t_demo(name,score) values('a',10); insert into t_demo(name,score) values('b',20); insert into...
比如where (column1,column2) in ((a1,b1),(a2,b2),(a3,b3)) 实例 建表 createtablet_demo( idintNOTNULLAUTO_INCREMENTPRIMARY KEY,namevarchar(10), scoreint);insertintot_demo(name,score)values('a',10);insertintot_demo(name,score)values('b',20);insertintot_demo(name,score)values('c',...
doc • mysql-filtering-by-multiple-columns[1] • selecting-where-two-columns-are-in-a-set[2] 外部链接 [1]mysql-filtering-by-multiple-columnshttps://www.tutorialspoint.com/mysql-filtering-by-multiple-columns [2]selecting-where-two-columns-are-in-a-sethttps://dba.stackexchange.com/questions...
•mysql-filtering-by-multiple-columns[1] •selecting-where-two-columns-are-in-a-set[2] 外部链接 [1]mysql-filtering-by-multiple-columnshttps://www.tutorialspoint.com/mysql-filtering-by-multiple-columns [2]selecting-where-two-columns-are-in-a-sethttps://db...
+---+ 2 rows in set Time: 0.119s 小结多列组合查询平常比较少见...doc • mysql-filtering-by-multiple-columns[1] • selecting-where-two-columns-are-in-a-set[2] 外部链接 [1]...mysql-filtering-by-multiple-columns https://www.tutorialspoint.com/mysql-filtering-by-multiple-columns 4.6K...
Re: Help: Multiple NEW columns in a WHERE clause 1491 William Chiquito November 07, 2006 08:24PM Sorry, you can't reply to this topic. It has been closed. This forum is currently read only. You can not log in or make any changes. This is a temporary situation. ...
遇到where查询太慢,我们第一步是需要分析数据类型的组成以及数据表的设置是否合理,其次我们可以使用explain对于查询语句进行分析,使用方式十分简单在需要优化的查询语句前面添加explain语句,对于所有的查询来说,覆盖索引的查找方式是最优解,因为覆盖索引不需要回表查数据。
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MySQL can use multiple-column indexes for queries that test all the columns in the index, or queries that test just the first column, the first two columns, the first three columns, and so on. If you specify the columns in the right order in the index definition, a single composite inde...
遇到where查询太慢,我们第一步是需要分析数据类型的组成以及数据表的设置是否合理,其次我们可以使用explain对于查询语句进行分析,使用方式十分简单在需要优化的查询语句前面添加explain语句,对于所有的查询来说,覆盖索引的查找方式是最优解,因为覆盖索引不需要回表查数据。