查詢時生成序號
select (select count([xlh].[aa]) as autonum from xlh where (((xlh.aa)<=xlh_alias.aa));) as 序號, xlh.aa
from xlh as xlh_alias inner join xlh on xlh_alias.aa=xlh.aa
order by xlh.aa;
多表sql查詢
select test.aa as 第乙個字段, test1.bb as 第二個字段, test1.cc
from test, test1
where test.aa=test1.aa;
多表sql查詢1
select a.aa, b.bb, b.cc, b.cc*100 as 合計
from test as a, test1 as b
where a.aa=b.aa;
多表sql查詢排序
select a.aa, b.bb, b.cc as 第三個字段
from test as a, test1 as b
where a.aa=b.aa
order by b.cc;
查詢例子
select a.dhhm
from xl11a as a, xl919 as b
where a.dhhm=b.dhhm and aa<>"1";
日期時間分隔符是#而不是引號
select * from tab1 where [date]>#2002-1-1#;
兩個表關聯修改多個字段
update chhl as a, jbsj as b set a.fzr = b.fzr, a.gh = b.gh
where a.dhhm=b.dhhm;
update chhl set (fzr,gh)=
(select b.fzr, b.gh
from chhl as a, jbsj as b
where a.dhhm=b.dhhm);
如果tab2可以不是乙個表,而是乙個查詢
update tab1 a,(select id,name from tab2) b
set a.name = b.name
where a.id = b.id;
update tab1 a,tab2 b
set a.name = b.name
where a.id = b.id;
訪問多個不同的access資料庫-在sql中使用in子句,外部資料庫不能帶密碼
select a.*,b.* from tab1 a,tab2 b in 'db2.mdb' where a.id=b.id;
將乙個表的某個欄位置空
update chhl as a set a.fzr = null, a.gh = null;
刪除兩個表中字段一樣的記錄
delete from xl11 where dhhm in(select a.dhhm
from xl11 as a, xl919 as b
where a.dhhm=b.dhhm;);
完成後access中欄位name索引屬性顯示為--有(無重複)
create unique index iname on tab1 (name);
下面的語句刪除剛才建立的兩個索引
drop index idate on tab1;
drop index iname on tab1;
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