if exists

Use if exists to build a table "go"1 Determine if the database has SQL codeif exists (SELECT * from sys.databases WHERE name = ' database name ')drop database [DB name] if exists (SELECT * from sys.databases WHERE name = ' database name ')drop

1 determining whether a database existsSQL codeif exists (SELECT * from sys.databases WHERE name = ' database name ')drop database [DB name] if exists (SELECT * from sys.databases WHERE name = ' database name ')drop database [DB name]2 Determining

In the SQL name, if not exists is if not present, if exists is if present.Below you learn the use of both.A to determine if the database does not existcode example: If NOT EXISTS (SELECT * from sys.databases WHERE name = ' database_name ')b, when

Original: SQL Server 2016 new feature: DROP IF EXISTS??When we write T-SQL to delete an object (table, stored procedure, etc.), it is customary to use the IF statement to determine whether the object exists and then drop it, for example:Old

The if exists function similar to MSSQL in ORACLE does not have if exists (...) in Oracle (...) currently, there are many solutions. Here, we first analyze the three commonly used methods. We recommend that you use the last one. The first one is the

There are many solutions to the syntax of Oracle without the IF exists (...), which is the first to analyze the three commonly used, the last one recommendedThe first is most commonly used to determine whether the value of count (*) is zero, as

Mother Egg. As a program that uses SQL Server for 4 to 5 years ape, start with Oracle really not used to. It's a hell of a different kind of notation. For example, write a statement like if EXISTS (SELECT * from sys.tables where name = ' xxxx ')

http://blog.csdn.net/hollboy/article/details/7550171 There are many solutions to the syntax of Oracle that do not have an if exists (...), here we first analyze the three commonly used, the last one is recommendedThe first is most commonly used to

What does this sentence mean? If exists (select * From DBO. sysobjects where id = object_id (n' [DBO]. [perper Excuse me: If exists (select * From DBO. sysobjects where id = object_id (n' [DBO]. [perpersondata] ') and objectproperty (ID,

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Oracle does not have the if exists (...) syntax. Currently, there are many solutions. Here we first analyze the three commonly used methods. We recommend that you use the last one. The first type is the most commonly used. Determine whether the

What does this sentence mean? If exists (select * From DBO. sysobjects where id = object_id (n' [DBO]. [perper Excuse me: If exists (select * From DBO. sysobjects where id = object_id (n' [DBO]. [perpersondata] ') and objectproperty (ID,

The Following oralce stored Procedures Act like the drop if exists feature of MySQL.   code is as follows copy code --" Determines whether a table exists and deletes the table if it exists. Create or Replace

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Back up the MySQL data table structure [Root@mysql ~]#/usr/local/mysql/bin/mysqldump-uroot-p ' admin '-D Mysql servers>/backup/mysql-structure-tables-$ ( Date +%f). sql[Root@mysql ~]# egrep-v

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{Code...} encountered an error after running {code ...}. CREATE DATABASE IF NOT EXISTS `shopImooc1`;USE `shopImooc1`;DROP TABLE IF EXISTS `imooc_admin`;CREATE TABLE `imooc_admin` ( `id` int(10) auto_increment key, `username` varchar(20) not

--查看对象是否已经存在  --数据库是否存在   --if exists (select * from sys.databases where name = ’数据库名’)    --  drop database [数据库名]      if exists(select * from sys.databases where name=‘FGM_POS‘)  print ‘存在‘--drop database [数据库名]   --表是否存在   --if exists (select *

Mysql stored procedure statement bitsCN.com 001 set @ Prov_Code: = 32; 002 set @ Prov_Name = "provincial/municipal departments"; 003 set @ Area_Code: = 3201; 004 set @ Area_Name = "municipal Bureau "; 005 006 007 SET FOREIGN_KEY_CHECKS = 0; 008 -- --