The DROP TABLE command cannot be used to delete a table that isreferenced by a foreign key constraint. Thereferencing FOREIGN KEY constraintor the referencing table must be deleted first. If both the referencing table and the table with the primary key are being deleted in the same DROP TABLE...
一个可选关键字,可用在 DELETE 关键字与目标 table_or_view_name 或 rowset_function_limited 之间 。 table_alias 在表示要从中删除行的表或视图的 FROMtable_source子句中指定的别名。 server_name 适用于:SQL Server 2008 (10.0.x) 及更高版本。
這是一個選擇性的關鍵字,可用於 DELETE 關鍵字和目標table_or_view_name或rowset_function_limited之間。 table_alias 在FROMtable_source子句中指定的別名,代表要刪除資料列的資料表或檢視。 server_name 適用於:SQL Server 2008 (10.0.x) 和更新版本。
Tips to optimize SQL Server deletes 1) Issue Table lock to avoid doing loads of row locks . Using a table hint , such as TABLOCK or TABLOCKX. Keep in mind – there may already be other transactions in progress , which may cause a delay on the DELETE request 2) Make sure statistics ...
The following SQL command deletes the clustered index CIX_EmpDetails_EmpId on the EmployeeDetails table. Example: Delete Clustered Index Copy DROP INDEX CIX_EmpDetails_EmpId ON dbo.EmployeeDetailsThe following SQL statement deletes the non-clustered index NCI_Employee_Email on the Employee table. ...
SQL UPDATETABLE1setcol1 =3wherecol3 ='Dallas' 该UPDATE语句由 SQL Server 实现为一对INSERTDELETE/语句,因为要更新col1,该语句定义了唯一索引。 因此,日志读取器在分发数据库中放置一对DELETE/INSERT调用。 这可能会影响订阅服务器上触发器或自定义存储过程中存在的任何业务逻辑。 应将其他业务逻辑合并到DELETE...
DROP TABLE的功能是用来删除已存在的Table。 2、语法 DROP TABLE [IF EXISTS] [db_name.]table_name; 说明:SQL中加[IF EXISTS] ,可以防止因表不存在而导致执行报错。 参数:db_name:Database名称。如果未指定,将选择当前database。table_name:需要删除的Table名称。
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In this article, we will learn how to delete data in a table in SQL Server 2014. TheDELETEstatement is used to delete the table data or a record of a table or to delete a view in SQL Server 2014. The DELETE command is used to remove rows from a table. We can use a WHERE clause...
Delete columns using Transact-SQL You can delete columns using Transact-SQL in SSMS,Azure Data Studio, or command-line tools such as thesqlcmd utility. The following example shows you how to delete a column. SQL ALTERTABLEdbo.doc_exbDROPCOLUMNcolumn_b; GO ...