Question

I have 2 different tables which look something like the following:

--------Table 1---------------------------------------------------------
Cat1           Cat2          Cat3        Value1
a                             d1           13
b              e1                          13
a              e2             d1           13
c                             d2           13
a              e1                          13
a                             d1           13
--------Table 2 -------------------------------------------------
Cat1           Cat2           Cat3       Value2    
a              e2             d1           113
c                             d2           132    
a                             d1           134
a                             d1           131
b              e1                          113
a              e1                          133

The Cat1 and Cat2 for above tables are same but might not be in same order. I want to combined both tables above so that desired table looks like following:

--------Desired Table---------------------------------------------------------
Cat1           Cat2          Cat3        Value1      Value2
a                             d1           13        134 
b              e1                          13        113
a              e2             d1           13        113
c                             d2           13        132
a              e1                          13        113
a                             d1           13        134

I am using apparently an older version of sybase.

Thanks!!

Answer 1

Just try this one (from my ANSI SQL experience):

    SELECT a.cat1,
           a.cat2,
           a.cat3,
           a.value1,
           b.value2
    FROM tab1 a
    LEFT OUTER JOIN
      (SELECT cat1,
              cat2,
              cat3,
              max(value2) value2
       FROM tab2
       GROUP BY cat1,
                cat2,
                cat3) b ON a.cat1 = b.cat1
    AND a.cat2 = b.cat2
    AND a.cat3 = b.cat3;