sql基本语句

1.几个简单的基本的sql语句
　　选择：select * from table1 where 范围

       示例：(_T("select * from MFSupport where BrandID = %d"), iID) 

　　插入一行：insert into table1(field1,field2) values(value1,value2)

       示例：(_T("insert into MFSupport(LineType, BandInfo,InnerID), values(\'%s\', \'%s\',%d) "), strLineType, strBandInfo, iInnerID)

　　删除一行：delete from table1 where 范围

       示例：(_T("delete from MFSupport where CfgName = %s and BrandID = %d"), strName， iBrandID)

　　更新：update table1 set field1=value1 where 范围

       示例：(_T("update MfSupport set IsSupport = %d where CfgName = %s"), iNum, strName)

　　查找：select * from table1 where field1 like ’%value1%’ ---like的语法很精妙，查资料!(待探究！)

      (select * from table1 where field1 like ’%雷锋%’ ---like的语法很精妙，查资料！不过会让索引失效，而select * from table1 where field1 like ’雷锋%’ 这句的的话索引是有效的！)

       示例：(_T("select * from MFBrand where BrandName like \"%%%s%%\" "), strBrandName)

　　排序：select * from table1 order by field1,field2 [desc]

　　总数：select count * as totalcount from table1

　　求和：select sum(field1) as sumvalue from table1

　　平均：select avg(field1) as avgvalue from table1

　　最大：select max(field1) as maxvalue from table1

　　最小：select min(field1) as minvalue from table1

           查询最小值的行：Select * from 表 where
字段 = (Select Min(字段) from 表)

SELECT *
FROM 表
WHERE (字段 IN
(SELECT MIN(字段)
FROM 表))

      插入一列: alter table table1 add field1 (初始化) comment XXX

      示例：(_T("alter table %S add %S int default 0 comment '%s'"), strTableName, strFieldName, strComment)

         (_T("alter table %S add %S varchar(0) comment '%s'"), strTableName, strFieldName, strComment)

      

     删除一列: alter table table1 drop field

     示例：(_T("alter table %s drop %s"), strTableName, strFileName)  //strTableName为表名，strFileName为字段名

     查询某一字段列是否存在：

     示例：select FieldName from TBL    //FieldName为需要查询的字段，TBL为表名