Iam trying to this in HQL:
select A.a A.a1, B.b,B.b1 from A,B
where A.x=B.x;
It is simple to realize the join with sql but when returninig in HQL I find a problem.
would you please give me the HQL syntax for the join
Thanks for help.
Maybe something like this would work:
select ai.a, ai.a1, bi.b, bi.b1
from A ai, B bi where ai.x = bi.x
Related
I know Hive only provide equi join. For example, below sql statement.
select *
from A join B
on A.c1 = B.c2
where 1=1;
But I want to execute Like join Query in Hive. For example, below sql statement.
select *
from A join B
on A.c1 like B.c2
where 1=1;
Please let me know if you know the solution in Hive.
How about -
ON A.c1 LIKE concat('%',B.c2,'%')
concat will concatenate % to the c2 data so like operator will work properly.
whole sql will be like -
select * from A join B on A.c1 LIKE concat('%',B.c2,'%') where 1=1;
version - hive 2.1.1
i'm having a technical and syntax problem with JOINS in ORACLE.
If i have 7 tables, listed below:
FROM
QT_QTS.PLA_ORDEM_PRODUCAO pla,
qt_qts.res_tubo_austenitizacao aust,
qt_qts.res_tubo_revenimento1 res_rev1,
qt_qts.res_tubo_revenimento2 res_rev2,
limsprod.SAMPLE sp,
limsprod.test t,
limsprod.result r
I need to get ALL the data in the "limsprod.result r" table linked with similar corresponding data inside the qt_qts.res_tubo_austenitizacao aust, qt_qts.res_tubo_revenimento1 res_rev1 and qt_qts.res_tubo_revenimento2 res_rev2 tables.
How can I do this join using Oracle Database? I tried a left join, but it did not work.
It is impossible to answer that question. We have nothing but list of some tables. I'm not sure I'd even want to do that instead of you.
However, here's a suggestion: start with one table:
select * from limsprod.result r;
It'll return all rows. Then join it to another table:
select *
from limsprod.result r join qt_qts.res_tubo_austenitizacao aust on aust.id = r.id
and see what happens - did you get all rows you want? If not, should you add another JOIN condition? Perhaps an outer join? Don't move on to the third table until you sort that out. Once you're satisfied with the result, add another table:
select *
from limsprod.result r join qt_qts.res_tubo_austenitizacao aust on aust.id = r.id
join qt_qts.res_tubo_revenimento1 res_rev1 on res_rev1.idrr = aust.idrr
Repeat what's being said previously.
I am facing some issue while joining multiple tables in oracle.
Here are the table structs:
TName : custac
acno - FK (acno custacdetails)
acbal
bid
Tname : custacdetails
custid - FK (custid custdetails)
acno - PK
actype
Tname : custdetails
custid - PK
fname
lname
Tname : branchdetails
bid
bname
I want to view all customers acno, acbal, branchname, fname, lname whose custid is 11111 and actype is 'SA'
I am using this query but i am getting wrong result
select a.acno,c.fname,c.lname,b.bname,a.acbal
from branch_details b,
custac a,
custacdetails d,
custdetails c
where c.custid=11111
and a.acno=d.acno
and a.branchid=b.bid
and actype='SA';
As per Tony891206 saying, you'Re doing a cartesian product. To avoid it, you need to tell how to join both tables together.
d.custid = c.custid
As follows:
select a.acno,c.fname,c.lname,b.bname,a.acbal
from branch_details b,
custac a,
custacdetails d,
custdetails c
where d.custid = c.custid
and c.custid=11111
and a.acno=d.acno
and a.branchid=b.bid
and actype='SA';
All credit goes to Tony891206.
This being said, as stated by a_horse_with_no_name:
Another good example why using explicit JOIN operators is better than the (outdated) implicit join in the where clause: you can't forget the join condition.
So the correct query should be written as follows.
select a.acno, c.fname, c.lname, b.bname, a.acbal
from branch_details b
join custac a on a.bid = b.bid
join custacdetails d on d.acno = a.acno
join custdetails c on c.custid = d.custid
where c.custid = 11111
and d.actype = 'SA'
This last query makes the relationship between the tables glaringly obvious, and allows for room in the where clause to specify only filter criterion.
If you want to know more about SQL syntaxes, please visit the followings:
Bad habits to kick : using old-style JOINs
Why isn't SQL ANSI-92 standard better adopted over ANSI-89?
Join (SQL)
In short, you would have had better chances to solve your problem by yourself using the SQL-92 join syntax over the SQL-89 one, since you would have had no other choice than to ask yourself how your tables may get joined together while writing the join clauses.
In addition to it, some say that there is a slight improvement on the performance using SQL-92 syntax, which I personally doubt. Besides, I do evangelize SQL-92 join syntax for it is easier to read than the SQL-89.
I'm really confusing about sub Query of hibernate.
I've standard oracle query but unable to convert it into HQL.
select distinct b.nameId
from
(
select nameId from seg_user where id=1
)a, seg_user b
where b.id=a.nameId
can somebody convert it to HQL by using SubQuery or Crieteria
select distinct b.nameId
from seg_user b
where b.id = some (
select a.nameId from seg_user a where a.id=1
)
You can see how to use subqueries here: http://docs.jboss.org/hibernate/orm/3.3/reference/en/html/queryhql.html#queryhql-subqueries
Does anyone know if there is a tool to convert T-SQL code to LINQ?
I'm struggling to find a way of converting the following SQL code to LINQ:
select * from actions as a
inner join
(
select max(actionid) as maxactionid, threaduid from actions as a
where a.actiontypeid not in (3,4)
group by threaduid
) as a2 on a2.maxactionid = a.actionid
where a.userid <> 2
Any help appreciated!
check out: http://www.sqltolinq.com/
There is linqer from http://www.sqltolinq.com/.
Linqer is a SQL to LINQ converter tool. It helps you to learn LINQ and convert your existing SQL statements.