几种数据库的语法的对比(整理中)

三、Access与语句SqlServer的语句语法区别
1、 Inser Into …..Select …From 语句：
在ACCESS中以下语句
Insert INTO
PubSubJectAccCopys(Copy_id,Acc_id,Acc_Pid,Acc_name,acc_short,Acc_Comment,Acc_Pro,acc_type,Sub_id_flag,acc_index) (Select 200201,Acc_id,Acc_Pid,Acc_name,acc_short,Acc_Comment,Acc_Pro,acc_type,Sub_id_flag,acc_index FROM PubSubJectAcc Where PubSubJectAcc.co_type='03')
中后面"(select 200201******.co_Type='03')"中的小括号("(",")")必须去掉才能执行，如下：
Insert INTO
PubSubJectAccCopys(Copy_id,Acc_id,Acc_Pid,Acc_name,acc_short,Acc_Comment,Acc_Pro,acc_type,Sub_id_flag,acc_index) Select 200201,Acc_id,Acc_Pid,Acc_name,acc_short,Acc_Comment,Acc_Pro,acc_type,Sub_id_flag,acc_index FROM PubSubJectAcc Where PubSubJectAcc.co_type='03'
在SQL SERVER 中都可以
2、 Inner Join 语句1
StrSql:='select a.user_id,a.user_opcode,b.copy_name from sysuser a inner join (syscopysuser c inner join syscopys b on c.copy_id=c.copy_id) on a.user_id=c.user_id where
a.user_opcode=''' +EdtUserOpCode.text+''' And copy_name='''+Tmpcopyname +'''';
应该改为
StrSql:='select a.user_id,a.user_opcode,b.copy_name from sysuser a inner join (syscopysuser c inner join syscopys b on c.copy_id=d.copy_id) on a.user_id=c.user_id where
a.user_opcode=''' +EdtUserOpCode.text+''' And copy_name='''+Tmpcopyname +'''';
该行代码的检索条件错误：应该把C.copy_id=C.Copy_id 改为c.copy_id=d.copy_id
注：两种写法都能在SQL-SERVER中运行，但c.copy_id=C.copy_id在ACCESS中不能运行
3、 Inner Join 语句2
StrSql:='select copy_year,copy_name,a.copy_id from SysCopys a inner join SysCopysUser b on a.curcopy_flag=1 and a.copy_id=b.copy_id where b.user_id=' + '''' +TmpPubUserID+ '''';
该为
StrSql:='select copy_year,copy_name,a.copy_id from SysCopys a inner join SysCopysUser b on a.copy_id=b.copy_id where a.curcopy_flag=''1'' and b.user_id=' + '''' +TmpPubUserID+ '''';
注：两种写法都能在SQL-SERVER中运行，但第一种在ACCESS中不能运行
4、 Inner Join语句3
SQl server 中可以执行以下语句
'Select distinct sysoption.opti_id,sysoption.opti_name,sysoption.opti_code,sysroleoption.opti_sort From sysoption inner join sysroleoption ON sysoption.opti_id=sysroleoption.opti_id AND sysroleoption.role_id=:roleid'
但ACCESS中不能，只能
'Select distinct sysoption.opti_id,sysoption.opti_name,sysoption.opti_code,sysroleoption.opti_sort From sysoption inner join sysroleoption ON sysoption.opti_id=sysroleoption.opti_id Where sysroleoption.role_id=:roleid'
5、 Update语句
Sql SerVer 中能执行但Access 中不能
'Update sysuserrole SET sysuserrole.role_sort = (Select sysrole.role_sort FROM sysrole Where sysuserrole.role_id = sysrole.role_id and sysuserrole.user_id='01')'
6、 日期比较
SQL SERVER 中用
StrSql:='select copy_year,Start_month,Cur_month,Start_Flag,Start_date,End_date '
+'From SysCopys '
+'where copy_id='''+LoginCopyID+''' '
+'and start_date<='''+datetostr(LoginDate)+''' '
+'and end_date>='''+datetostr(LoginDate)+'''';
ACCESS中用
StrSql:='select copy_year,Start_month,Cur_month,Start_Flag,Start_date,End_date '
+'From SysCopys '
+'where copy_id='''+LoginCopyID+''' '
+'and start_date<=#'+datetostr(LoginDate)+'# '
+'and end_date>=#'+datetostr(LoginDate)+'#'
参考以上的第10个函数“GetDateStr”
7、 最大数值获取语句
StrSql:='insert into sysRoleOption '
+'select '''+fidRoleId+''' as Role_ID,opti_id,'
+'convert(numeric,opti_id)-(convert(numeric,opti_parentid)*100)+'+ MaxOptiSort
+' as opti_Sort from sysoption where opti_parentid='''
+PCoTypeID(self.trvRoles.Selected.data)^.StrCoTypeID
+''' and opti_bottom=''1'+'''';
改为
StrSql:='insert into sysRoleOption '
+'select '''+fidRoleId+''' as Role_ID,opti_id,'
+'opti_id-opti_parentid*100+'+ MaxOptiSort
+' as opti_sort from sysoption where opti_parentid='''
+PCoTypeID(self.trvRoles.Selected.data)^.StrCoTypeID
+''' and opti_bottom=''1'+''''
注：两种写法都能在SQL-SERVER中运行，但第一种在ACCESS中不能运行
但是考虑会出现Null值以及语句的通用性，可以使用以上的第07个函数“GetNullStr”和第09个函数“GetConvertStr”来完成字符串向数字，空值和0数字的转换：参考GetNextNumStr代码。