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By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0. 1228849 fiddles created (16650 in the last week).

with t (c,p) as ( select 2,1 from dual ), rec (c,p) as ( select c,p from t union all select t.* from rec join t on rec.c = t.p ) select * from rec
ORA-01789: query block has incorrect number of result columns
 hidden batch(es)


select * from v$version
BANNER BANNER_FULL BANNER_LEGACY CON_ID
Oracle Database 18c Express Edition Release 18.0.0.0.0 - Production Oracle Database 18c Express Edition Release 18.0.0.0.0 - Production Version 18.4.0.0.0 Oracle Database 18c Express Edition Release 18.0.0.0.0 - Production 0
 hidden batch(es)