在Oracle数据库中,没有直接的DROP TABLE IF EXISTS语法,这与MySQL等数据库不同。为了在Oracle中实现类似的功能,你可以使用PL/SQL块来检查表是否存在,并在存在的情况下执行删除操作。以下是一个详细的解答: Oracle没有直接的"DROP TABLE IF EXISTS"语法: Oracle数据库没有提供类似于MySQL的DROP TABLE IF EXISTS语...
mysql中如果表存在则删除有语句:drop table if exists schema.table; 但是oracle并不支持这样的语句,可以自己用procedure来实现。亲测有效。 创建procedure来实现drop table if exists schema.table; --/createorreplaceprocedurejoe.PROC_DROPTABLEIFEXISTS(p_tableinvarchar2)ast_countnumber(10);beginselectcount(*)...
SQL> drop table non_exists; drop table non_exists ORA-00942: 表或视图不存在 drop table容错的方法是: BEGIN DROP TABLE non_exists_table; EXCEPTION WHEN OTHERS THEN IF sqlcode != -0942 THEN RAISE; END IF; END; drop sequence容错的方法是: BEGIN DROP SEQUENCE non_exists_sequence; EXCEPTION WH...
execute immediate 'DROP FUNCTION ' || ObjName; end if; end if; if upper(ObjType) = 'TRIGGER' then select count(*) into v_counter from User_Triggers where TRIGGER_NAME = upper(ObjName); if v_counter > 0 then execute immediate 'DROP TRIGGER ' || ObjName; end if; end if; if up...
Oracle 的drop table if exists功能 Oracle创建表时,常遇到先删除后创建的情况,而它又没有drop table... if exists语法。为此可以使用user_objects数据字典和动态sql语句实现类似的功能,如下所示: create or replace procedure proc_dropifexists( p_table in varchar2...
if v_count > 0 then execute immediate 'drop table ' || p_table ||' purge'; end if; end proc_dropifexists; exec proc_dropifexists('d_product'); CREATE TABLE d_product ( id number(12) primary key, product_name varchar(100) NOT NULL, ...
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CREATE OR REPLACE PROCEDURE DROPEXITSTABS (TAB_NAME_IN IN varchar2) IS v_cnt Number; begin select count(*) into v_cnt from user_tables where table_name = upper(TAB_NAME_IN); if v_cnt>0 then execute immediate 'drop table ' || TAB_NAME_IN ||' purge'; end If; end DROPEXITSTABS...
Oracle don't support IF EXISTS, but we can make it manually. Activity Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment Metadata AssigneesNo one assigned LabelsNo labels TypeNo type ProjectsNo projects MilestoneNo milestone RelationshipsNone yet ...
DROP TABLE IF EXISTS [table_name] Oracle: BEGIN EXECUTE IMMEDIATE 'DROP TABLE [table_name]'; EXCEPTION WHEN OTHERS THEN NULL; END; 1. SQL Server: IF EXISTS ( SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = '[table_name]') DROP TABLE [table_name] ...