SELECT count(*) AS cnt FROM sqlite_master WHERE type='table' AND name='table_name';cnt will return 0, if the table doesn't exist, 1 if it does. 或者, SELECT name FROM sqlite_master WHERE type='table' AND name='{table_name}';This will return empty, if t
每当在数据库中创建一个对象,所有者可以分配它访问权限.所有者通常是执行创建语句的用户.对于大多数类型的对象,初始状态是,只有所有者(或超级用户)可以修改或删除对象.为了让其他角色或用户使用它,特权或权限必须是理所当然. 为了给用户分配权限,使用 GRANT 命令. 1.授权语法 GRANT命令的基本语法如下: GRANT privilege [, ...] ON object [, ...] TO { PUBLIC | GROUP group | username } privilege 可能的
using Model; using System; using System.Collections.Generic; using System.Data; using System.Data.SqlClient; using System.IO; using System.Windows.Forms; namespace DataImport { public partial class Form1 : Form { public List<string> _photoFilePathLi
select TABLE_NAME from ( select TABLE_NAME ,) as cnt from information_schema.tables where TABLE_SCHEMA in ('db_a','db_b') and (table_name not like '%2018%' and table_name not like '%2019%') group by TABLE_NAME ) t1 limit ;
一.sql server数据库写法: update a set a.ksgmm=b.ksgmm,a.ksgm=b.ksgm,a.scztm=b.scztm,a.sczt=b.sczt from landsde.sde.jszb a,kyqcldb.dbo.kcl_ksjj b where a.nd=b.nd and a.kqbh=b.kqbh and a.djflbh =b.djflbh 其中landsde.sde.jszb.kyqcldb.dbo.kcl_ksjj是不同数据库下的不同数据表 二