1.QL概述 2.据库查询 1）用SELECT语句从表中提取查询数据。语法为 SELECT [DISTINCT] {column1,column2,…} FROM tablename WHERE {conditions} GROUP BY {conditions} ORDER BY {expressions} [ASC/DESC]; 说明：SELECT子句用于指定检索数据库的中哪些列，FROM子句用于指定从哪一个表或视图中检索数据。 2）SELECT中的操作符及多表查询WHERE子句。(LIK
oracl 和db2 常用语法比较： 1、取前N条记录 Oracle：Select * from TableName where rownum <= N; DB2：Select * from TableName fetch first N rows only; 2、取得系统日期 Oracle：Select sysdate from dual; DB2：Select current timestamp from sysibm.sysdummy1; 3、空值转换 Oracle：Select
DataView RowFilter Syntax [C#] This example describes syntax of DataView.RowFil ter expression. It shows how to correctly build expression string (without „SQL injection“) using methods to escape values. Column names If a column name contains any of
