uniol all in the select statement

Hi I have a situation where I have to return the value based on the if statement, is it possible to put union all in the select statement

My use case is

IN the column State

If column01 > 0 to condtion 't'

IF column02 > 0 that the condition of 'Y '.

Condition IF COLUMN03 > 0 THAN 'w '.

If COLUMN04 > 0 that the condition of "Z".

Select 't'

TableName

where column01 > 0

Union of all the

Select "y".

TableName

where column02 > 0

Union of all the

Select 'W '.

TABLENAME

WHERE COLUMN03 > 0

I have what it takes to show value as it

EmpName, condition, empno

Jerry, T, 0158754585

TOM, Y, 0054789568

Am in oracle database 11 g 2

Yes you can put all THE UNION here

Select empname, 't' State, empno from tablename where column01 > 0

Union of all the

Select empname, 't' State, empno from tablename where column02 > 0

Union of all the

Select empname, condition of "W", empno FROM tablename WHERE COLUMN03 > 0

Union of all the

Select empname, condition of "Z", empno FROM tablename WHERE COLUMN04 > 0

and if you are looking for how to remove duplicates because your line might have satisfied all the conditions and my happen 4 times in your result set, you just need to give them an order and filter it.

For example, you want this

If column01 > 0 to condtion 't'

ELSE IF column02 > 0 that the condition of 'Y '.

Another condition of THAN > 0 IF COLUMN03 'w '.

otherwise if COLUMN04 > 0 that the condition of "Z".

Select empname, condition, empno, in

(

Select a.*, row_number() over (partition by empno arrested by myorder) rn

Of

(

Select empname, 't' State, empno, 1 myorder tablename where column01 > 0

Union of all the

Select empname, 't' State, empno, 2 myorder tablename where column02 > 0

Union of all the

Select empname, condition of "W", empno 3 myorder FROM tablename WHERE COLUMN03 > 0

Union of all the

Select empname, empno, condition of 'Z', 4 myorder FROM tablename WHERE COLUMN04 > 0

) a

) where rn = 1

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