1. Entire row getting duplicated because there is no primary key or unique key. 2. Only primary key or unique key value is different, but remaining all values are same. Scenario 1: Delete duplicate rows without primary key or unique key. Let us create the following example. create table c...
我们可以采取以下步骤: -- 开始一个事务BEGINTRANSACTION;-- 假设执行了误删除操作DELETEFROMemployeesWHEREid=1;-- 查看日志中的操作记录SELECT*FROMfn_dblog(NULL,NULL)WHEREOperation='LOP_DELETE_ROWS';-- 如果确认要撤销,则可以进行回滚ROLLBACKTRANSACTION; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. ...
SELECT[TransactionID],[BeginTime],[TransactionName]FROMfn_dblog(NULL,NULL)WHERE[TransactionName]='DELETE'AND[TransactionID]IN(SELECTDISTINCT[TransactionID]FROMfn_dblog(NULL,NULL)WHERE[TransactionName]='LOP_DELETE_ROWS'); 1. 2. 3. 4. 5. 6. 7. 8. 请注意,该查询将返回删除操作的事务ID、开...
SQL Copier DELETE Sales.ShoppingCartItem OUTPUT DELETED.* WHERE ShoppingCartID = 20621; --Verify the rows in the table matching the WHERE clause have been deleted. SELECT COUNT(*) AS [Rows in Table] FROM Sales.ShoppingCartItem WHERE ShoppingCartID = 20621; GO ...
代码语言:sql AI代码解释 SELECT * FROM Customers WHERE Country='Germany' FETCH FIRST 3 ROWS ONLY; 添加ORDER BY 关键字 在要对结果进行排序并返回排序后结果的前 3 条记录时,添加 ORDER BY 关键字。 对于SQL Server 和 MS Access: 代码语言:sql AI代码解释 按CustomerName 字母降序排序结果,并返回前 3...
FETCHFIRST3ROWSONLY; 使用旧版 Oracle 的 ROWNUM 以下SQL 语句展示了旧版 Oracle 的等效示例: 选择"Customers" 表的前 3 条记录: SELECT*FROMCustomers WHEREROWNUM<=3; 添加WHERE 子句 以下SQL 语句从 "Customers" 表中选择前三条记录,其中国家是 "Germany"(对于 SQL Server/MS Access): ...
SQL database in Microsoft Fabric Removes one or more rows from a table or view in SQL Server. Transact-SQL syntax conventions Syntax syntaxsql -- Syntax for SQL Server and Azure SQL Database[WITH<common_table_expression>[ ,...n ] ]DELETE[TOP( expression ) [PERCENT] ] [FROM] { {table...
SQL Server marks the record as being “ghosted”. Then a background thread in SQL Server periodically finishes the job of removing these records from the page by fully deleting them and doing any related cleanup work – such as adjusting the slot array. When a record is marked as a “...
Applies to: SQL ServerDeletes rows from a conflict table or the MSmerge_conflicts_info (Transact-SQL) table. This stored procedure is executed at the computer where the conflict table is stored, in any database.Transact-SQL syntax conventions...
Applies to: SQL ServerDeletes rows from a conflict table or the MSmerge_conflicts_info (Transact-SQL) table. This stored procedure is executed at the computer where the conflict table is stored, in any database.Transact-SQL syntax conventions...