sqlserver 一张表两列都的值都相同处理
欢迎进入Windows社区论坛,与300万技术人员互动交流 >>进入 今天业务需要,网上没找到 最后写出来了就留个印以备查阅 #T1表中 A,B 列 至少三行都相同的数据 SELECT * FROM #T1 t1 WHERE ( SELECT COUNT(*) FROM( SELECT DISTINCT A,B FROM #T1 WHERE A=t
欢迎进入Windows社区论坛,与300万技术人员互动交流 >>进入
今天业务需要,网上没找到 最后写出来了就留个印以备查阅
#T1表中 A,B 列 至少三行都相同的数据
SELECT * FROM #T1 t1 WHERE
(
SELECT COUNT(*) FROM(
SELECT DISTINCT A,B FROM #T1 WHERE A=t1.A
) A
)=1
AND (SELECT DISTINCT COUNT(ID) FROM #T1 WHERE A=t1.A)>=3
ORDER BY t1.A

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The import steps are as follows: Copy the MDF file to SQL Server's data directory (usually C:\Program Files\Microsoft SQL Server\MSSQL\DATA). In SQL Server Management Studio (SSMS), open the database and select Attach. Click the Add button and select the MDF file. Confirm the database name and click the OK button.

For objects with the same name that already exist in the SQL Server database, the following steps need to be taken: Confirm the object type (table, view, stored procedure). IF NOT EXISTS can be used to skip creation if the object is empty. If the object has data, use a different name or modify the structure. Use DROP to delete existing objects (use caution, backup recommended). Check for schema changes to make sure there are no references to deleted or renamed objects.

1. First, we right-click the blank space of the taskbar and select the [Task Manager] option, or right-click the start logo, and then select the [Task Manager] option. 2. In the opened Task Manager interface, we click the [Services] tab on the far right. 3. In the opened [Service] tab, click the [Open Service] option below. 4. In the [Services] window that opens, right-click the [InternetConnectionSharing(ICS)] service, and then select the [Properties] option. 5. In the properties window that opens, change [Open with] to [Disabled], click [Apply] and then click [OK]. 6. Click the start logo, then click the shutdown button, select [Restart], and complete the computer restart.

When the SQL Server service fails to start, here are some steps to resolve: Check the error log to determine the root cause. Make sure the service account has permission to start the service. Check whether dependency services are running. Disable antivirus software. Repair SQL Server installation. If the repair does not work, reinstall SQL Server.

To view the SQL Server port number: Open SSMS and connect to the server. Find the server name in Object Explorer, right-click it and select Properties. In the Connection tab, view the TCP Port field.

If you accidentally delete a SQL Server database, you can take the following steps to recover: stop database activity; back up log files; check database logs; recovery options: restore from backup; restore from transaction log; use DBCC CHECKDB; use third-party tools. Please back up your database regularly and enable transaction logging to prevent data loss.

SQL Server database files are usually stored in the following default location: Windows: C:\Program Files\Microsoft SQL Server\MSSQL\DATALinux: /var/opt/mssql/data The database file location can be customized by modifying the database file path setting.

If the SQL Server installation fails, you can clean it up by following these steps: Uninstall SQL Server Delete registry keys Delete files and folders Restart the computer
