不想永远做旁观者，就立即行动~~

最近拜读一位前辈的blog,感触良多，也间接增加了很多经历。

前辈有云，要立即行动，吾又思量，临渊羡鱼，不如退而结网，故写此篇，开始自己的blog.

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也没准备好什么，简单说下自已最近学到的。

在access中也可以用到一些比较高级的语法(虽然写起来较sqlserver麻烦)：

1.不存在时插入

INSERT INTO T_INV ( lccode,spcode,Qty,Cost,xssl )
SELECT '001' AS 表达式1,T_POD.spid,0 AS 表达式2,0 AS 表达式3,0 AS 表达式4
FROM T_POD
WHERE (((T_POD.[NO])='PO201004280001') AND (( not Exists (select * from T_INV where T_INV.lccode = '001' and T_INV.spcode = T_POD.SPID
))=true));

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2.isnull的变体

SELECT V_SPXX_LOCATION.T_SPXX.code AS 品号,V_SPXX_LOCATION.T_LOCATION.code AS 仓库编号,iif(isnull(T_Inv.Qty),T_Inv.Qty) AS 库存数量,V_SPXX_LOCATION.productname AS 品名,V_SPXX_LOCATION.name AS 仓库名称,*
FROM V_SPXX_LOCATION LEFT JOIN T_Inv ON (V_SPXX_LOCATION.T_LOCATION.code=T_Inv.lccode) AND (V_SPXX_LOCATION.T_SPXX.code=T_Inv.spcode);

3. 带null 的筛选

SELECT T_Inv.*,V_sel_TakeIn.*FROM T_Inv LEFT JOIN V_sel_TakeIn ON (T_Inv.lccode = V_sel_TakeIn.lccode) AND (T_Inv.spcode = V_sel_TakeIn.spcode)WHERE (((V_sel_TakeIn.lccode) Is Null));

（编辑：李大同）

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