I need to get it in T-SQL so the test can verify that it's zero. I cannot modify the procedure to make the unit test work. I can change any T-SQL that is not in the procedure itself. Note that the caller of the procedure (in .NET), correctly gets the zer...
Query the number of rows in each table through SSMS is a simple task, just follow these steps: Select the **Object Explorer **panel; Click to expand until the desired database; Select the **Tables **folder; See this output SQL script in the image below ...
SqlDataReader's RecordsAffected property you can use only for Insert update or delete. In this case this function returns number of rows affected by this commands. If you use this method in selecte command return value will be always -1. So you can't use RecordsAffected method to get numbe...
SQLSpecialColumns 函式 SQLStatistics 函式 SQLTablePrivileges 函式 SQLTables 函式 SQLTransact 函式 設定DLL API 參考 安裝程式 DLL API 參考函式 翻譯DLL的API參考文件 ODBC 服務提供者介面 (SPI) 參考 ODBC 附錄 ODBC 數據源管理員 Microsoft-Supplied ODBC 驅動程式 ODBC 詞彙 ODBC 測試 ODBCconf.exe OLE...
MySQL主从同步至少需要用到2台服务器,一台为master库,另一台为slave库,要实现复制首先需要在master上开启bin-log日志功能,bin-log日志用于记录在Master库中执行的增、删、修改、更新操作的sql语句,整个过程需要开启3个线程,分别是Master开启IO线程,Slave开启IO线程和SQL线程。
How to get the number of rows from a table reside in a linked server as fast as possible. Forum – Learn more on SQLServerCentral
在SQLGetInfo 是使用 SQL_KEYWORDS 调用的并且缓冲区长度为 0 时,SQL Server Native Client 中的 SQLGetInfo 不同于 SQL Server ODBC 驱动程序中的 SQLGetInfo。SQL Server Native Client 驱动程序返回 SQL_SUCCESS,但 SQL Server ODBC 驱动程序返回 SQL_SUCCESS_WITH_INFO。但在使用小于输出关键字字符串的非零...
select * from table_a,table_b where table_a.id=table_b.id; 它们的执行效率没有区别,只是书写方式不同,用逗号是sql 89标准,join 是sql 92标准。用逗号连接后面过滤条件用 where ,用 join 连接后面过滤条件是 on。 1.4 order by 排序 全局排序,只会有一个reduce ...
SQL_MAX_STATEMENT_LEN (32 位无符号整数) 指示SQL 语句字符串的最大长度 (以字节计) ,包括语句中的空格数。 SQL_MAX_TABLE_NAME_LEN (16 位整数) 表名的最大长度 (以字节计)。 SQL_MAX_TABLES_IN_SELECT (16 位整数) Indicates the maximum number of table names in a FROM clause in a <query ...
Cross join refers to the Cartesian product of two tables. It produces cross product of two tables. The above query can be written using CROSS JOIN clause. A Cartesian product result table is normally not very useful. In fact, such a result table can be terribly misleading. If you execute ...