LeftJOIN(SELECT"ACCOUNT","PASSWORD","NICKNAME","NAME","AVATAR","BIRTHDAY","SEX","EMAIL","PHONE","TEL","LASTLOGINIP","LASTLOGINTIME","ADMINTYPE","STATUS","TENANTID","CREATEDTIME","UPDATEDTIME","CREATEDUSERID","CREATEDUSERNAME","UPDATEDUSERID","UPDATEDUSERNAME","ISDELETED","ID"FROM"SY...
SELECT VTW.ID AS TRX_ID, VS.SESS_ID, VS.SQL_TEXT, VS.APPNAME, VS.CLNT_IP FROM V$TRXWAIT VTW LEFT JOIN V$TRX VT ON(VTW.ID=VT.ID) LEFT JOIN V$SESSIONS VS ON(VT.SESS_ID=VS.SESS_ID); sp_close_session('sess_id'); 1. 2. 3. 4. 5. 6、安装教程 7、存储过程 CREATE OR RE...
(2)左外连接LEFT JOIN ON关键字左侧的表的所有数据均显示,关键字右侧的表匹配内容显示,无对应内容使用NULL填充 (3)右外连接RIGHT JOIN ON关键字右侧的表的所有数据均显示,关键字左侧的表匹配内容显示,无对应内容使用NULL填充 (4)交叉 连接CROSS JOIN交叉连接返回的结果是被连接的两个表中所有数据行的笛卡尔积即...
1:是,当分区表发生了行迁移时,将UPDATE逻辑日志更改为DELETE+INSERT日志 RLOG_LLOG_COMPRESS 0 动态,系统级 是否开启对INSERT逻辑日志的压缩功能。建议插入操作较多导致日志文件过大的情况下使用。0:不开启;1:开启 LOGMNR_PARSE_LOB 0 动态,系统级 LOGMNR包是否支持挖掘行外大字段逻辑日志。0:不支持;1:支持...
CREATE TABLE dmhr.emp AS SELECT employee_id, employee_name, identity_card, salary, department_id FROM dmhr.employee WHERE employee_id IN (1109,1110,1111,1112,1113); UPDATE dmhr.emp SET department_id = 999 WHERE employee_id = 1112; UPDATE dmhr.emp SET department_id = NULL WHERE employe...
8. HASH LEFT JOIN2 简写为HLO2,HASH左外连接。一般等值连接时使用。 explain select *from t1 left join t2 on t1.c1 = t2.c1; #NSET2: [13, 1, 0] #PRJT2: [13, 1, 0]; exp_num(4), is_atom(FALSE) #HASH LEFT JOIN2: [13, 1, 0]; key_num(1), ...
select*fromV$LONG_EXEC_SQLS torderbyt.FINISH_TIMEdesclimit50;select*fromV$LONG_EXEC_SQLS torderbyexec_timedesclimit20;select*fromV$LONG_EXEC_SQLS twheresql_textnotlike'UPDATE t_version%'orderbyexec_timedesclimit20;select*fromV$LONG_EXEC_SQLSlimit50; ...
"; }$result= dm_autocommit($link,false);//事务自动提交关闭$query="UPDATE DMHR.CITY SET CITY_NAME='辽宁' WHERE (CITY_ID='SY')";$result= dm_exec($link,$query);if($result){ echo"更新成功,回滚。"; } dm_rollback($link);//回滚//dm_commit($link);//提交$result= dm_autocommit($...
BEGINselectt.USERNAMEintol_local_userfromuser_users t;forfin(selectUSERNAMEfromdba_users twheret.usernamenotin(l_local_user))LOOPFORRIN(SELECTtable_nameFROMuser_tables)LOOPEXECUTE IMMEDIATE'grant select,delete,insert,update on ' ||R.table_name ||' to ' || F.USERNAME;ENDLOOP;ENDLOOP;END; ...
在达梦数据库中,常用的 SQL 语句包括:SELECT、INSERT、UPDATE、 DELETE 等。其中,SELECT 语句用于查询数据,INSERT 语句用于插入 数据,UPDATE 语句用于更新数据,DELETE 语句用于删除数据。 除了这些基本的 SQL 语句外,达梦数据库还支持其他高级的 SQL 语句,例如 JOIN 语句、GROUP BY 语句、HAVING 语句等。这些语句可...