database,username,password)ifcheck_if_data_exists(conn,table_name):print("表中存在数据。")else:print("表中没有数据。")conn.close()if__name__=="__main__":main() 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17.
if exists(select * from sys.databases where name='MyNewDb') drop database MyNewDb--删除数据库 create database MyNewDb on primary--主数据文件有一个,默认文件组 ( name='MyNewDb', filename='e:/MyNewDb.mdf', size=3Mb, maxsize=10Mb, filegrowth=1MB ) ,filegroup FileGroupS ( name='My...
I coded this page a while back, but I'm thinking there must be a better way to do this. What I want to do is check real-time if various records exist in my database from a function in my C# code. What I've done is added a sqldatabase onto my page, as well as a grid...
IF EXISTS(SELECT * FROM sysDatabase WHERE name='stuDB') DROP DATABASE stuDB CREATE DATABASE stuDB ……建库代码略 问题:检查本次考试,本班如果有人笔试成绩达到80分以上,则每人提2分。否则,每人允许提5分。 IF EXISTS(SELECT * FROM stuMarks WHERE writtenExam>80) BEGIN print '本班有人笔试成绩...
http://sqlhints.com/2014/04/13/how-to-check-if-a-table-exists-in-sql-server/ DECLARE @dbname nvarchar(128) SET @dbname = N'database_name' IF NOT EXISTS (SELECT name FROM master.dbo.sysdatabases WHERE ('[' + name + ']' = @dbname OR name = @dbname)) BEGIN CREATE DATABASE TuoT...
WHERE NOT EXISTS (SELECT TITLE_ID FROM SALES WHERE TITLE_ID = TITLES.TITLE_ID) 可以改写成: SELECT TITLE FROM TITLES LEFT JOIN SALES ON SALES.TITLE_ID = TITLES.TITLE_ID WHERE SALES.TITLE_ID IS NULL B、 如果保证子查询没有重复 ,IN、EXISTS的相关子查询可以用INNER JOIN 代替。比如: ...
and exists(select 1 from '+@db2+'.dbo.sysobjects where xtype '+@collation+'=t.xtype '+@collation+' and name '+@collation+'=t.name'+@collation+') order by name ') --objects exist in one database, but not exist in another ...
create database 数据库名称 on primary --默认在主文件组上 ( name='逻辑名称_data' , --当你发现它不是一句完整的sql语句,而仅仅是一个处理结构中的某一句的时候,就需要添加 , size=初始大小,--数值不包含在‘’以内 filegrowth=文件增长 ,
使用phpmyadmin导入数据库显示Can't create database 'xxx',database exists 的解决方法! Linux下yum常用命令汇总 microsoft jet database engine 80040e4d 错误如何解决 centos6.5下JDK详细安装配置步骤 WIN2003下JDK的详细安装配置步骤 phpstudy的下载安装教程 mssql数据库中的孤立账户 理解编译中的三个命令./configu...
mssql-服务器陷入脚本升级模式.也不能登录[root@node1 ~]# cat start-cluster.sh #! /bin/bash ...