ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.
ALTER TABLE - DROP COLUMN To delete a column in a table, use the following syntax (notice that some database systems don't allow deleting a column): ALTERTABLEtable_name DROPCOLUMNcolumn_name; The following SQL deletes the "Email" column from the "Customers" table: ...
If you are not the owner of the table, you need the DROP ANY TABLE privilege in order to use the drop_table_partition or truncate_table_partition clause. You must also have space quota in the tablespace in which space is to be acquired in order to use the add_table_partition, modify_...
The ALTER TABLE statement allows you to rename an existing table. It can also be used to add, modify, or drop a column from an existing table. //z 2012-08-09 09:36:26 IS2120@.T3277072977[T64,L417,R16,V609] Renaming a table The basic syntax for renaming a table is: ALTER TABLE...
您输入的 SQL 语句包含无效的 ALTER TABLE 语句。可能的原因:保留字或参数名拼写错误或遗漏。 标点不正确。另请参阅访问开发人员论坛 访问support.office.com 上的帮助 访问answers.microsoft.com 上的帮助 访问UtterAccess 上的论坛 访问开发人员和 VBA 编程帮助中心 (FMS) 访问StackOverflow 上的帖子...
Syntax error in ALTER TABLE statement. (Error 3293) Article 06/14/2014 Expand table You entered an SQL statement that includes an invalid ALTER TABLE statement.Possible causes:A reserved word or argument name is misspelled or missing. Punctuation is incorrect....
Groups of ALTER TABLE syntax: alter_table_properties::= column_clauses::= constraint_clauses::= alter_table_partitioning::= alter_external_table_clauses::= move_table_clause::= enable_disable_clause::= After each clause you will find links to its component subclauses. ...
Syntax #1 To add a column to an existing table, the ALTER TABLE syntax is: ALTER TABLE table_name ADD column_name column-definition; For Example: ALTER TABLE supplier ADD supplier_name varchar2(50); This will add a column calledsupplier_nameto thesuppliertable. ...
1>.查看RENAME TABLE语句的帮助信息 mysql> ? RENAME TABLE 2>.RENAME TABLE语句用来重命名一个或多个表名。 mysql> RENAME TABLE students TO new_students; 3>.当想让两个表名相互调换是,可以执行以下语句 mysql> RENAME TABLE course TO temp_table, new_students TO course,temp_table TO new_students;...
SQL database in Microsoft Fabric Specifies a set of options that can be applied to an index that is part of a constraint definition that is created by usingALTER TABLE. For a complete description of index options, seeCREATE INDEX. Transact-SQL syntax conventions ...