To drop multiple columns, you use the statement below: ALTERTABLEtable_nameDROP( column_name_1, column_name_2 );Code language:SQL (Structured Query Language)(sql) Oracle DROP COLUMN clause example The following statement removes theemailandphonecolumns from thesupplierstable: ...
Example to drop a single column:ALTER TABLE Customer UNUSED (Age);Result:Example to drop Multiple column:ALTER TABLE Customer UNUSED (Age, Address, Country);Result:How to DROP columns from an existing table in oracleNext Recommended Reading Oracle: The importance of enabling autobackup in RMAN ...
ALGORITHM=INSTANT is optional here as, by default, all ADD/DROP columns are done with ALGORITHM=INSTANT. Multiple columns can be ADD/DROP in a single ALTER TABLE STATEMENT. How Does it work? A new concept of row version is introduced in table metadata. The way this feature works is, a ...
# MySQL ALTER TABLE - DROP Multiple Columns 在MySQL中,ALTER TABLE语句用于修改现有的数据库表。你可以使用ALTER TABLE语句来添加、修改或删除表中的列。本文将重点介绍如何使用ALTER TABLE语句一次删除多个列。 ## ALTER TABLE语法 ALTER TABLE语句的基本语法如下: ```sql ALTER TA MySQL 数据库表 sql 原创...
Oracle/ Oracle Database/ Release 23 SQL Language Reference Purpose Use theDROPTABLEstatement to move a table or object table to the recycle bin or to remove the table and all its data from the database entirely. Note: Unless you specify thePURGEclause, theDROPTABLEstatement does not result ...
構文およびセマンティクスの詳細は、『Oracle Database PL/SQL言語リファレンス』を参照してください。CREATE TYPE文を使用すると、オブジェクト型、SQLJオブジェクト型、名前付きの可変配列(VARRAY)、ネストした表型または不完全なオブジェクト型の仕様部を作成できます。CREATE TYPE文およびCREATE...
Oracle DROP TABLE PURGE example The following statement drops thecarstable using thePURGEclause: DROPTABLEcarspurge;Code language:SQL (Structured Query Language)(sql) Drop multiple tables at once Oracle provides no direct way to drop multiple tables at once. However, you can use the following PL...
#MySQLALTER TABLE -DROPMultiple Columns 在MySQL中,ALTER TABLE语句用于修改现有的数据库表。你可以使用ALTER TABLE语句来添加、修改或删除表中的列。本文将重点介绍如何使用ALTER TABLE语句一次删除多个列。 ## ALTER TABLE语法 ALTER TABLE语句的基本语法如下: ```sql ALTER TA ...
You can use this statement to drop tables from OceanBase Database. Syntax DROP {TABLE | TABLES} [IF EXISTS] table_name [,table_name]... [RESTRICT | CASCADE] Parameters Examples Drop thetest1table withIF EXISTSspecified. obclient> DROP TABLE IF EXISTS test1; ...
The nickname must be listed in the catalog (SQLSTATE 42704). The nickname is deleted from the database. All information about the columns and indexes associated with the nickname is deleted from the catalog. Any materialized query tables that are dependent on the nickname are dropped. Any ...