后端python代码: #coding:utf8 from flask import Flask,request,render_template import pymysql as mysql import json con = mysql.connect(user=',db="t1") con.autocommit(True) cur = con.cursor() app = Flask(__name__) #新建app @app.route('/') #设置路由 def index
--oracle删除数据库表(无主键)中重复的记录 1, CREATE TABLE newtable as SELECT distinct * FROM T_SYSTEM_MENU_PRIV; 2, drop table T_SYSTEM_MENU_PRIV; 3, ALTER TABLE newtable rename to T_SYSTEM_MENU_PRIV;
--删除数据库表数据 慎用 create PROCEDURE sp_DeleteAllData AS ) ) ) ) ) ) begin try begin tran -- 失效索引,触发器 open tb fetch next from tb into @tblName begin set @sNOCHECKCONSTRAINT ='ALTER TABLE ' + @tblName+ ' nocheck CONSTRAINT ALL' set @sDISABLETRIGGER ='ALTER
--/第1步**********删除所有表的外键约束*************************/ DECLARE c1 cursor for select 'alter table ['+ object_name(parent_obj) + '] drop constraint ['+name+']; ' from sysobjects where xtype = 'F' open c1 declare @c1 varchar(8000) fetch next from c1 int
oracle多表关联删除的两种方法 第一种使用exists方法 delete from tableA where exits ( select 1 from tableB Where tableA.id = tableB.id ) 第二种使用匿名表方式进行删除 delete from ( select 1 from tableA,TableB where tableA.id = tableB.id ) 这种方法只适合两个表都有主键或外键的时候,若是关联一个管道函数就无法删除成功,会提示错误
步骤一: 删除user drop user ×× cascade 说明: 删除了user,只是删除了该user下的schema objects,是不会删除相应的tablespace的. 步骤二: 删除tablespace DROP TABLESPACE tablespace_name INCLUDING CONTENTS AND DATAFILES;