topic Re: Can three inner joins be used in a proc sql in SAS Procedures

Can three inner joins be used in a proc sql

shru — Wed, 21 Nov 2012 04:11:17 GMT

Hi,

There are four tables which are explicitly joined in a proc sql,can i use three inner joins for the same to get same results

have a little confusion on this.

for example:

proc sql;

select a.*,b.*,c.*,d.*

from ahru as a, dsdf as b,ghdgfs as c,gfgsfs as d

where a.dsss=b.gadfgafd;

;

quit

So for the same can i use three inner joins?

Also,bit curious about what is the maximum inner joins we can use?

Your help is needed

Shru

Re: Can three inner joins be used in a proc sql

RichardinOz — Wed, 21 Nov 2012 04:36:49 GMT

SQL with inner joins on 4 or more tables is perfectly feasible. You have to be careful that all the joins are stated, to avoid some sort of cartesian product.

In your example you are joining the same table (gfgsfs) twice. If this is intentional note that the columns represented by d.* are the same as those represented by c.*, and SAS will not allow duplicate column names. You can rename them on the fly or as a ddataset option if need be.

Richard in Oz

Re: Can three inner joins be used in a proc sql

Haikuo — Wed, 21 Nov 2012 16:37:37 GMT

You can join as many as 32 tables at once if my memory servers me right.

Haikuo