在SQL Server中,删除表中某个列的正确SQL语句是A.ALTER TABLE 表名 DELETE 列名B.ALTER TABLE 表名 DELETE COLUMN
-例如：ALTER TABLE table_name ADD FOREIGN KEY (column_name) REFERENCES other_table_name (column_name)ON DELETE CASCADE;5.使用子查询删除数据：在DELETE语句中可以使用子查询来指定需要删除的记录。-例如：DELETE FROM table_name WHERE column_name IN (SELECT column_name FROM other_table_name WHERE ...
This article describes how to delete table columns in SQL Server using SQL Server Management Studio (SSMS) or Transact-SQL.Caution When you delete a column from a table, the column and all the data it contains are deleted.Limitations and restrictionsYou can't delete a column that has a ...
INSERT [INTO] table_or_view_name (column_name[,…]) VALUES (expression)[,…] 向表中插入数据: 结果如下: 3.3 UPDATE语句 修改数据库中数据。语法如下: UPDATE table_or_view_name [FROM {}[,…]] SET column_name = expression | DEFAULT | NULL [,…] WHERE search_condition 修改表格中姓名为...
] table_or_view_name [ AS ] table_or_view_alias [ <tablesample_clause>] | derived_table [ AS ] table_alias [ ( column_alias [ ,...n ] ) ] } syntaxsql Copier -- Syntax for Parallel Data Warehouse DELETE [ FROM [database_name . [ schema ] . | schema. ] table_name ] [...
INSERT [INTO] table_or_view_name (column_name[,…]) VALUES (expression)[,…] 向表中插入数据: 结果如下: 3.3 UPDATE语句 修改数据库中数据。语法如下: UPDATE table_or_view_name [FROM {}[,…]] SET column_name = expression | DEFAULT | NULL [,…] WHERE search_condition...
SQL DELETEFROMProduction.ProductCostHistoryWHEREStandardCost >1000.00; GO The following example shows a more complex WHERE clause. The WHERE clause defines two conditions that must be met to determine the rows to delete. The value in theStandardCostcolumn must be between12.00and14.00and the value ...
如需詳細資訊,請參閱FROM (Transact-SQL)。 WHERE 指定用來限定刪除之資料列數的條件。 如果未提供 WHERE 子句,DELETE 會移除資料表中的所有資料列。 以WHERE 子句指定的內容為基礎的刪除作業有兩種形式: 搜尋刪除指定用來限定要刪除的資料列之搜尋條件。 例如,WHEREcolumn_name=value。
SQL Copy DELETE FROM Production.ProductCostHistory WHERE StandardCost > 1000.00; GO The following example shows a more complex WHERE clause. The WHERE clause defines two conditions that must be met to determine the rows to delete. The value in the StandardCost column must be between 12.00 and...
有关详细信息,请参阅FROM (Transact-SQL)。 WHERE 指定用于限制删除行数的条件。 如果没有提供 WHERE 子句,则 DELETE 删除表中的所有行。 基于WHERE 子句中所指定的条件,有两种形式的删除操作: 搜索删除指定搜索条件以限定要删除的行。 例如,WHEREcolumn_name=value。