資料庫統計不同欄位數量時的sql語句,欄位數量sql語句今天對一個表A中欄位進行查詢,不同類型的欄位進行資料統計;1.select count(1) from A where strwhere 對合格行數進行統計2.select count(filed) from A where strwhere 對符合條件列的行數進行統計,基本同上下面才是今天重頭戲3.當欄位存在類型,且為0,1時,最為簡單,但常用如:1.男,女;2.是,否;等可以用
【Oracle】CBO版本帶來的視圖INVALID,cboinvalid源端:Oracle 11.1.0.7目標端:Oracle 11.2.0.4最近做的一個資料移轉的CASE中遇到的問題,一個VIEW在完成資料移轉後由VALID的狀態變為了INVALID。從源庫中使用get_ddl拿到的該VIEW建立語句如下:CREATE OR REPLACE FORCE VIEW "APPS"."IGW_BU
【leetcode SQL】Employees Earning More Than Their Managers,leetcodeearningThe Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id.+----+-------+-----
【leetcode SQL】Second Highest Salary,leetcodehighest原題如下:Write a SQL query to get the second highest salary from the Employee table.+----+--------+| Id | Salary |+----+--------+| 1 | 100 || 2 | 200 || 3 | 30
【leetcode SQL】Customers Who Never Order,leetcodecustomersSuppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anything.Table: Customers.
rman 增量恢複 dg gap後 主庫添加新資料檔案,rmangap1) On the standby database, 關閉 (MRP)SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;2) On the STANDBY DATABASE, 擷取備庫最小scn值,用作主庫增量備份點 :col MIN(CHECKPOINT_CHANGE#) for 999999999999999999col