目录1.UNION 操作符简介2.基本语法3.使用规则和限制4.UNION vs UNION ALL5.示例演示6.注意事项mysql 中的 UNION 操作符用于合并两个或多个 SELECT 语句的结果集，生成一个单一的结果集。它常用于从多个表或查询中提取
on clicking any row of the following program... I am firing on function mail file click....function just having alert message that shows different file name on the basis of clicking...
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