Error occuring in SELECT statement FOR UPDATE when using WITH cluase

Question

Hi,
Iam using oracle 11g version
Iam having a query with fetch records for update insid with cluase as
cursor c1 is
With abc as (
SELECT col1,col2 from table1, table2 where < condition>
for update of <col1> skip locked
select * from abc,table3 where <condition>
union all
select * from table4 where id not in (select * from abc)
if i add "for update of <col1> skip locked" this cluase
iam getting error ORA-00907: missing right parenthesis
when i remove "for update of <col1> skip locked" the block is working fine..
can i know why error is occuring i

Answer 1

Hi, first of all, your placing of "for update" clause is wrong. It should be at the end like:
With abc as (
SELECT col1,col2 from table1, table2 where < condition>
select * from abc,table3 where <condition>
union all
select * from table4 where id not in (select * from abc)
for update of <col1> skip locked;Second, if you try to compile it with this syntax then you will get a new error.
ORA-01786:     FOR UPDATE of this query expression is not allowed
Cause:     An attempt was made to use a FOR UPDATE clause on the result of a set expression involving GROUP BY, DISTINCT, UNION, INTERSECT, or MINUS.
Action:     Check the syntax, remove the FOR UPDATE clause, and retry the statement.So, you will not be successful with the union clause in your query.