Query1 Union Query2 and not exits(query1) Gopa On Jun 17, 2011 9:17 AM, "Gayathri" <gd0...@gmail.com> wrote: > Hi All, > > I need to combine 2 queries given below. Please suggest. > > Here is the details of table and its data: > > create table tab1 > (col2 number, > col3 number); > > create table tab2 > (col1 number, > col2 number, > col3 number); > > insert into tab1 values(1, 233); > insert into tab1 values(2, 23); > insert into tab1 values(3, 23); > insert into tab1 values(4, 256); > insert into tab1 values(5, 130); > > insert into tab2 values(1234, 1, 5); > insert into tab2 values(1536, 2, 3); > insert into tab2 values(1536, 3, 7); > insert into tab2 values(1234, 4, 5); > insert into tab2 values(1234, 5, 7); > > ---------------------------------------------------------- > How can I combine these 2 query? > > *Query 1* > select tab1.col3 > from tab1, tab2 > where tab2.col1 <> 1234 > and tab2.col2 = tab1.col2 > and rownum = 1 > order by tab2.col3 desc > ; > > If no_data_found then Query 2. > > *Query 2* > select tab1.col3 > from tab1, tab2 > where tab2.col1 = 1234 > and tab2.col2 = tab1.col2 > and rownum = 1 > order by tab2.col3 > ; > > If no_data_found then return NULL. > > > Thanks > G > > -- > You received this message because you are subscribed to the Google > Groups "Oracle PL/SQL" group. > To post to this group, send email to Oracle-PLSQL@googlegroups.com > To unsubscribe from this group, send email to > oracle-plsql-unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/Oracle-PLSQL?hl=en
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