2.多表关联更新时,使用再加上inner join 或 left join等连接,示例如下 UPDATE t_user_bank b SET is_active='是' FROM t_user_arch u INNER JOIN t_deposit d ON u.arch_id=d.arch_id WHERE u.arch_id=b.arch_id and d.balance=0 and u.rec_no='2021090306002' 二、想用多表关联查询并且dele...
mysql> update [表名] set age = 25 where name =’aaa’; 修改数据 mysql> delete form [表名] where name = ‘bbb’; 删除数据 MySQL数据类型与操作 数值类型:tinyint、int、float、double 字符类型:char、varchar、text、enum 日期类型:datetime 特殊的值:NULL MySQL中的运算符 算数运算符:+ - * / ...
from pro_produced_component a left join pro_factory pf on a.factory_id = pf.id left join pro_component_type b on a.type = b.code and coalesce(pf.company_id, ''') = coalesce(b.company_id, ''') left join pro_project_area d on a.area_id = d.id left join pro_project_area p...
BEGIN;DELETE FROM COMPANY WHERE AGE = 25;ROLLBACK; lock 锁主要是为了保持数据库数据的一致性,可以阻止用户修改一行或整个表,一般用在并发较高的数据库中。在多个用户访问数据库的时候若对并发操作不加控制就可能会读取和存储不正确的数据,破坏数据库的一致性。数据库中有两种基本的锁:排它锁(Exclusive Locks)...
SELECT `DictTypeId`,`Value`,`Code`,`OrderNo`,`Remark`,`Status`,`CreateTime`,`UpdateTime`,`CreateUserId`,`UpdateUserId`,`IsDelete`,`Id` FROM `SysDictData` WHERE ( `DictTypeId` = 14544926246725 ) AND ( `IsDelete` = 0 )ORDER BY `OrderNo` ASC【MySQL数据库---异常 2023/10/11 星期...
(r.rolname, c.oid, 'DELETE') AS can_delete FROM pg_class c JOIN pg_namespace n ON n.oid = c.relnamespace CROSS JOIN pg_roles r LEFT JOIN pg_authid_member m ON m.member = r.oid WHERE m.roleid = (SELECT oid FROM pg_roles WHERE rolname = current_user) OR r.rolname = ...
(c.oid)ASvacuum_count,pg_stat_get_autovacuum_count(c.oid)ASautovacuum_count,pg_stat_get_analyze_count(c.oid)ASanalyze_count,pg_stat_get_autoanalyze_count(c.oid)ASautoanalyze_countFROMpg_class cLEFTJOINpg_index iONc.oid=i.indrelidLEFTJOINpg_namespace nONn.oid=c.relnamespaceWHEREc.rel...
STL_DELETE STL_DISK_FULL_DIAG STL_DIST STL_ERROR STL_EXPLAIN STL_FILE_SCAN STL_HASH STL_HASHJOIN STL_INSERT STL_LIMIT STL_LOAD_COMMITS STL_LOAD_ERRORS STL_LOADERROR_DETAIL STL_MERGE STL_MERGEJOIN STL_MV_STATE STL_NESTLOOP STL_PARSE STL_PLAN_INFO STL_PROJECT STL_QUERY STL_QUERY_METRICS...
UPDATE, INSERT und DELETE Legt FOUND auf „true“ fest, wenn mindestens eine Zeile betroffen ist, und auf „false“, wenn keine Zeile betroffen ist. FETCH Legt FOUND auf „true“ fest, wenn eine Zeile zurückgegeben wird, und auf „false“, wenn keine Zeile zurückgegeben wird. ...
Use the DELETE command to request resource deletion. SELECTstatus, content_type, content::json->>'url'ASurlFROMhttp_delete('http://httpbun.com/delete'); status | content_type | url ---+---+--- 200 | application/json | http://httpbun.com/delete As a shortcut to send data to a...