ALTERTABLEtable_nameDROPCOLUMNcolumn_name1, [DROPCOLUMNcolumn_name2]; 在上面语法中, table_name是包含要删除列的表名称。 column_name1,column_name2是将要删除的列。 MySQL和PostgreSQL支持上述语法。 Oracle和SQL Server的语法略有不同: ALTERTABLEtable_nameDROPCOLUMNcolumn_name1, [column_name2]; 2. SQ...
sql:drop column 报错 ALTER TABLE table_name DROP COLUMN column_name 运行时报错 这时我们需要先删除这个依赖 ALTER TABLE table_name DROP CONSTRAINT DF__role__MANAGE_MAC__2B2A60FE 运行完删除依赖指令后我们就可以删除列了 ALTER TABLE table_name DROP COLUMN column_name...
SQL语言与数据库操作技术大全3.5.3 删除列——DROP COLUMN第3章数据库与表的操作在关系数据库中,数据都是存储在表中的。在上一章已经讨论了在SQLServer2005中使用ManagementStudio创建数据库和表。在本章将主要介绍使用SQL对数据库和表进
SQL Server 2016 and later adds the ability to add IF EXISTS to ALTER TABLE DROP COLUMN that checks for the column’s existence and dropping it if it does all in one line of T-SQL. -- attempt to drop column HomePhone using IF EXISTS to see if it exists – SQL Server 2016 and upAL...
消息5074,级别 16,状态 1,第 2 行对象“DF__CompanyTr__Creat__0CDAE408”依赖于“已创建”列。消息 4922,级别 16,状态 9,第 2 行 ALTER TABLE DROP COLUMN 创建失败,因为一个或多个对象访问此列。 这是一个代码优先表。不知何故,迁移变得一团糟,我正在尝试手动回滚一些更改。
2、Flink SQL示例 1)、非分区表示例 2)、分区表 五、Flink SQL常见的操作示例 本文简单介绍了DROP、alter、insert和analyze的语法及示例 ,并且将FLink sql常用的sql以java 方法整理成一个类,可以直接在java中使用,或在Flink sql cli中直接使用。 本文依赖flink集群能正常使用。 本文示例java api的实现是通过Flink...
DROP COLUMNThe DROP COLUMN command is used to delete a column in an existing table. The following SQL deletes the "ContactName" column from the "Customers" table:Example ALTER TABLE CustomersDROP COLUMN ContactName; Try it Yourself » ...
DROP query used used to delete a table or a column or some other properties associated with the table. To remove all records from a table usetruncatesql command. Deleting a Table SQL DROP command to removecontenttable inside the database. ...
SQL Replication must be at Version 10.2.1 (ARCH_LEVEL 1021) or higher. About this task After you issue an ALTER TABLE DROP COLUMN statement for a source table and then a REORG statement for the table space, the Capture program detects the change, removes the column from ...
The column name in the scheme isn't restricted to the columns in the index definition. Any column in the base table can be specified. filegroup_name Applies to: SQL Server 2008 (10.0.x) and later versions. Specifies a filegroup as the location for the resulting table. If no location is...