MS SQLSERVER和ORACLE中取出表中按照某欄位排序的前N條記錄 這個題目看上去似乎那麼簡單, 兩種資料庫都提供ORDER BY 子句. 問題應該能夠迎刃而解吧. 先試一下MS SQLSERVER是怎麼做的: use Northwind;create table TestSort (ID integer);insert into testSort values (3);insert into testSort values (1);insert into testSort
下午修改oracle datebase中的欄位時,提示"Record is locked by another user",錯誤可想而知。 下面解除鎖 1、查看鎖select t2.username,t2.sid,t2.serial#,t2.logon_time from v$locked_object t1,v$session t2 where t1.session_id=t2.sid order by t2.logon_time;2、Kill--alter system kill
偶寫一個銷售查詢的功能模組,但在測試的時候按 條碼/編碼/庫房 條件排序的時候都沒有錯誤,只要按日期查的時候就會有“Ora-01791 不是Selected運算式”的錯誤資訊,於是查看我的SQL語句,語句如下:select distinct GoodsId,Barcode,DepotId,GoodsName from sa_sale where depotid='11' order by selldate這句話執行的時候就有錯誤 ,但把排序換成 order by Goodsid
下面試Oracle的分頁,效率比傳統的分頁高,但是存在的缺點是,當查詢最後一頁時,效率跟傳統的分頁效率時一樣的。select * from (select rownum rn, a.* from (select int_id from cell) a where rownum <= (頁數 + 每頁資料量))where rn >= (頁數+1)Informix的分頁使用:select skip m first n * from tableName 其中m
下面這兩種方法可行:EXEC SQL BEGIN DECLARE SECTION;typedef struct{ int a; int b;}abc;EXEC SQL END DECLARE SECTION;struct bbb{ int a; int b;};EXEC SQL BEGIN DECLARE SECTION; VARCHAR username[20]; VARCHAR password[20]; abc a; struct bbb b;EXEC
1、尋找一個表的主鍵和索引極其它們的欄位查主鍵名稱: select CONSTRAINT_NAME from user_constraints where table_name ='abc' and constraint_type ='P'; 查主鍵對應的列: select COLUMN_NAME from user_cons_columns where table_name = 'abc' and constraint_name =
關於SQL Server SQL語句查詢分頁資料的解決方案:要求選取 tbllendlist 中 第3000頁的記錄,每一頁100條記錄。-----------------------------------方法1:----------select top 100 * from tbllendlist where fldserialNo not in(select top 300100 fldserialNo from tbllendlist order by
(一)oracle擷取多個值拼接 WMSYS.wm_concat(u.user_name) AS SERVERNAMESeg:select t.d_no,WMSYS.wm_concat(t.REQUEST) REQUEST from aisuser.OPR_REQUEST_DO t where t.request_stage=:requestStage group by t.d_no(二)oracle 條件--這個相當於不加條件(有時候某列會有空值)select * from
ora-22835:Buffer to small for clob to char or Blob to raw conversion(actual string,maxinum string) cause:an attempt was made to convert CLOB to CHAR or BLOB to RAW, where the LOB size was bigger than the buffer limit for CHAR and RAW types. Note