标签：表名 inf use for color mat 字段名 objects tab
如何字段名查找所在的表名
SELECT TABLE_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_NAME = ‘字段名字‘ select syscolumns.name,sysobjects.name from syscolumns , sysobjects where syscolumns.id = sysobjects.id and syscolumns.name=‘已知字段名
select * from user where username=‘张三‘ or username=‘李四‘优化为可写成：select * from user where username in(‘张三‘,‘李四‘)技术点就是，sql中where条件用‘in‘要比用"="效率要高,在千万级查询时效果比较明显
标签：表名 inf use for color mat 字段名 objects tab
原文地址：http://www.cnblogs.com/isuben/p/6180343.html
