oracle三表关联查询语法
利哑侵2656ORACLE外联查询 -
华包尚13557645514 ______ select a.a_id,b.a_id,c.a_id,max(c.dealtime) from A a,B b,C c where a.a_id=b.a_id(+) and a.a_id=c.a_id(+) group by a.a_id,b.a_id,c.a_id order by submittime desc
利哑侵2656oracle 3表联合查询问题 -
华包尚13557645514 ______ select s.s#,s.sn from s,c,sc where s.s#=sc.s# and c.c#=sc.c# and c.cn='数学'
利哑侵2656求一条oracle的多表联合查询sql,请高手指教 -
华包尚13557645514 ______ oracle10g select a.uid,a.uname,wm_concat(d.teamName) as team,b.type from table1 a inner join table2 b on a.uid=b.uid inner join table3 c on a.uid=c.uid inner join table4 d on c.teamid=d.teamid group by a.uid,a.uname,b.type;
利哑侵2656oracle数据库中,不同用户下的多表关联的SQL查询统计怎么写 -
华包尚13557645514 ______ select * from usersa.tables,usersb.tables where xx=xxx 类似
利哑侵2656oracle怎么使用关系表进行联合查询 -
华包尚13557645514 ______ 1.根据学生id查:select a.sname,a.age,c.zscardnum,c.zxtype from stu a,gx b,zs c where a.sid=b.sid and b.zsid=c.zsid and a.sid='你要查的id'2.根据证书id查:select a.sname,a.age,c.zscardnum,c.zxtype from stu a,gx b,zs c where a.sid=b.sid and b.zsid=c.zsid and c.zsid='你要查的id'
利哑侵2656用oracle查找,两张表有个关联字段,根据关联字段分别group by两张表里另 -
华包尚13557645514 ______ oracle两表关联查询可用以下语句. 有以下两张表: 现在要通过deptno字段,在查询中显示emp表中全部内容和dept表中的dname字段. 可用如下语句: select a.*,b.dname from emp a,dept b where a.deptno=b.deptno
利哑侵2656ORACLE多表关联查询问题 -
华包尚13557645514 ______ Select a.A_id,b.B_name,c.C_name,d.D_name,e.E_name,a.A_min,a.A_desc From TableA a,TableB b,TableC c,TableD d,TableE e Where a.B_id=b.B_id(+) And a.C_id=c.C_id(+) And a.D_id=d.D_id(+) And a.E_id=e.E_id(+) 正确答案
利哑侵2656oracle关联查询 -
华包尚13557645514 ______ select id, name, phone, ip, loginDate from (select a.id, a.name, a.phone, b.ip, b.loginDate, row_number() over(partition by a.id order by loginDate desc ) rk -- 按登陆时间降序排列 from user a, work b where trim(a.id) = trim(b.userid)) -- 用用户id关联 where rk = 1 -- 取最晚登陆的记录
利哑侵2656oracle 怎么看索引 关联的是哪张表 -
华包尚13557645514 ______ 1. 查询一张表里面索引 select * from user_indexes where table_name=XX; 2. 查询被索引字段 select * from user_ind_columns where index_name=XX; 3.查询数据库中所有索引 select * from user_objects where object_type='INDEX'; 可以通过 desc table_name; 来查看这三张表的数据结构,选择自己需要的字段查看.
利哑侵2656三个表连接查询并汇总 -
华包尚13557645514 ______ select a.aa,sum(t1.数量a),sum(t1.数量b),sum(t1.数量c),sum(t2.数量d),sum(t2.数量e),sum(t2.数量f),sum(t3.数量g),sum(t3.数量h),sum(t3.数量k),(select aa from t1 union select aa from t2 union select aa from t3) ta left outer join t1 on ta.aa = t1.aa left outer join t2 on ta.aa = t2.aa left outer join t3 on ta.aa = t3aa group by ta.aa