update of the lookup using the fusion query table

Hi Experts,

My requirement is, we have total 4 tables called x, y, z and a_lookup table. join between these tables column is deptno.

I need to update a_lookup table based on less than the conditions of the

condition1: table a_lookup update with the corresponding records of X and Y

condition2: If there is no record in X does not match, then we have to compare with Z and update the table a_lookup accordingly

Here is the table scripts and my attempt as well.

Only doubt is, is my fine appearance of MERGE statement, or is it otherwise better update the a_lookup table?

Please share your ideas on this.

create table x (empno, deptno number);

-Samples

Insert into x
Select the level, level * 10 double connect by level < = 10;

create table y (empno number, number deptno).

-Samples

Insert y
Select the level, level * 10 double connect by level < = 5;

create table z (empno number, number deptno);

-Samples

Insert into z
Select the level, level * 10 double connect by level < = 10;

create the table a_lookup (empno number, deptno_lookup number);

-Samples

insert into a_lookup
Select null, level * 10 double connect by level < = 10;

-Merging of records in a_lookup based on X, Y, z. using right outer join on X and Y

Fusion in a_lookup one

using the ((select x.deptno, x.empno from x, y where x.deptno = y.deptno)

Union of all the

(select z.deptno, z.empno in z, (select x.deptno from x, y where x.deptno = y.deptno and y.deptno is null) res1)

where z.deptno = res1.deptno)

) res

on (a.deptno_lookup = res.deptno)

When matched then

update set a.empno = res.empno;

See you soon,.

Suri ;-)

Like this

Fusion in a_lookup one

a_l'_aide_de)

Select deptno nvl (a.deptno, z.deptno)

empno nvl (a.empno, z.empno)

z

left

Join them)

Select x.deptno

x.empno

x

left join y

On x.deptno = y.deptno

where y.empno is not null

) a

On z.deptno = a.deptno

) b

on)

a.deptno_lookup = b.deptno

)

When matched then

update set a.empno = b.empno;

Tags: Database

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