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How do I solve the error: An error was encountered while running (Domain = LaunchServicesError, Code = 0) ?I get this error when I try to run my app i... 阅读全文
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//// ViewController.m// QBImagePickerControllerDemo//// Created by Tanaka Katsuma on 2013/12/30.// Copyright (c) 2013年 Katsuma Tanaka. All rights ... 阅读全文
摘要:
在sql语名中,if not exists 即如果不存在,if exists 即如果存在。下面学习下二者的用法。a,判断数据库不存在时代码示例:if not exists(select * from sys.databases where name = 'database_name')b,判断表不存... 阅读全文