IF OBJECT_ID('your_schema.your_table_name', 'U') IS NOT NULL BEGIN DROP TABLE your_schema.your_table_name; END ELSE BEGIN PRINT 'Table does not exist'; END 注意事项 在执行这些脚本之前,请确保将your_table_name替换为你想要删除的表的名称。 在某些情况下,你可能还需要指定表的模式(schema)...
begin select count(*) into c from user_tables where table_name = upper('continent'); if c = 1 then execute immediate 'drop table continent'; end if; end; 这两个脚本都运行良好,但我的老板想要IF EXIT类的东西。任何人都可以帮助我。在这种情况下如何使用 IF EXIT ?
If a table does not exist, dropping it will throw an error. To fix this issue, we can add the optionalIF EXISTScommand while dropping a table. For example, -- delete Orders table if it existsDROPTABLEIFEXISTSOrders; Run Code Here, the SQL command will only drop a table if there exist...
drop database [数据库名] 2 判断表是否存在 Sql代码 if exists (select * from sysobjects where id = object_id(N’[表名]’) and OBJECTPROPERTY(id, N’IsUserTable’) = 1) drop table [表名] if exists (select * from sysobjects where id = object_id(N’[表名]’) and OBJECTPROPERTY(id...
DROPTABLEIFEXISTS`student`; CREATETABLE`student` ( `stuid`varchar(16)NOTNULLCOMMENT'学号', `stunm`varchar(20)NOTNULLCOMMENT'学生姓名', PRIMARYKEY (`stuid`) )ENGINE=InnoDBDEFAULTCHARSET=utf8; -- --- -- Records of student -- --- INSERT...
(1):查询一个数据库中是否存在某个表(两种方式):假设表名为table_name if Exists(select * from sysobjects where name='table_name') drop table table_name 或 if object_id('table_name') is not null drop table table_name 同样的操作也可用来判断数据库是否存在!
2. Why Should We Check if a Table Exists Before Dropping It? The DROP TABLE clause deletes a table and all its data from the database in SQL. However, this commandthrows an error when the table doesn’t exist in the database used,disrupting the flow of the SQL script or application....
Submitted by: eXandr (i.reg) Votes: 4 It should be possible to determine not cause an error when deleting an object that does not exist Something like that: execute statement 'ALTER TABLE SOME_TABLE DROP [IF EXISTS] SOME_FIELD'; -- no ra...
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DROP TABLE [ IF EXISTS ] table_name 參數 IF EXISTS 如果指定,當數據表不存在時,不會擲回任何TABLE_OR_VIEW_NOT_FOUND錯誤。 table_name 要刪除的資料表名稱。 名稱不得包含時態規格或選項規格。 如果找不到數據表,Azure Databricks 就會引發TABLE_OR_VIEW_NOT_FOUND錯誤。