> UPDATE adla1 > SET pflopf = ( > SELECT pflopf > FROM adl > WHERE adl.ref = adla1.ref) > WHERE ( > SELECT COUNT(*) > FROM ( > SELECT 1 FROM adl > WHERE adl.ref = adla1.ref > LIMIT 2 > ) > ) = 1; > > Not all sure what LIMIT 2 does there. I think a SQL-92 version > would be >
Limit, limits number of rows selected by ref. If we have found 2, no need to lookup further. That's why it was said to be a slightly optimized version. Generally this saves some disk reads. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
