DROP [TEMPORARY] TABLE [IF EXISTS] table_name [, table_name] [RESTRICT | CASCADE];让我们分解语法：DROP TABLE 语句永久删除表及其行。[TEMPORARY] 选项可确保仅删除临时表。[IF EXISTS] 选项仅在表存在时删除表。[RESTRICT] 确保在子行引用所述父行中的值时不删除父行。[CASCADE] 选项可确保在删除行时...
IF OBJECT_ID('tempDB..#myTempName','U') IS NOT NULL drop table #myTempName--Brad (My Blog)Tuesday, November 3, 2015 11:23 AM | 3 votesIf you install SQL Server 2016 you can use DROP TABLE IF EXISTS namehttp://blogs.msdn.com/b/sqlserverstorageengine/archive/2015/11/03/drop-if...
So here’s the easy solution. We need to check if the temp table exists within the TempDB database and if it does, we need to drop it. [cc lang=”sql”] IF OBJECT_ID(N’tempdb..#Temp’) IS NOT NULL BEGIN DROP TABLE #Temp ...
if upper(ObjType) = 'TABLE' then select count(*) into v_counter from user_tables where table_name = upper(ObjName); if v_counter > 0 then execute immediate 'drop table ' || ObjName || ' cascade constraints'; end if; end if; if upper(ObjType) = 'PROCEDURE' then select count(*...
DROP [TEMPORARY] TABLE [IF EXISTS] table_name [, table_name] ... [RESTRICT | CASCADE] Argument: Example: If you want to drop the table newauthor, the following sql can be used. DROP TABLE IF EXISTS newauthor; The above MySQL statement above will remove the 'newauthor' table with all...
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In diesem Beispiel wird die IF EXISTS-Syntax, die verfügbar ist, wenn mit SQL Server 2016 (13.x) begonnen wird, nicht verwendet.SQL Kopieren CREATE TABLE #temptable (col1 INT); GO INSERT INTO #temptable VALUES (10); GO SELECT * FROM #temptable; GO IF OBJECT_ID(N'tempdb..#temp...
3回答 SQL DROP TABLE函数 你好,我已经在我的大学提供的VM中创建了一个表,并插入了以下内容: create table first_table (record_id int primary key, first_name varchar“我键入了DROP TABLE [IF EXISTS] first_table” 然后它就什么都不做了。知道为什么吗。
The following example creates a temporary table, tests for its existence, drops it, and tests again for its existence. This example does not use theIF EXISTSsyntax which is available beginning with SQL Server 2016 (13.x). SQL CREATETABLE#temptable (col1INT); GOINSERTINTO#temptableVALUES(10...
DELETE TABLE Em_temp C. DROP FILE Em_temp D. DELETE FILE E. m_temp 相关知识点: 试题来源: 解析 A 正确答案:A解析:本题考查SQL语句删除表。格式DROP TABLE。DROPTABLE直接从磁盘上删除所对应的.dbf文件。题目删除表Em_temp。 知识模块:关系数据库标准语言SQL反馈 收藏 ...