Maybe the second option better? Or it will take much time?

NOW() function returns the same value for each call in BEGIN...END block ------------------------------------------------------------------------ Key: TEIID-5290 URL: https://issues.jboss.org/browse/TEIID-5290 Project: Teiid Issue Type: Bug Components: Query Engine Affects Versions: 10.1 Environment: teiid-10.1.0 on WildFly Full 11.0.0.Final (WildFly Core 3.0.8.Final) Reporter: dalex dalex Assignee: Steven Hawkins Fix For: 10.2 Run the following queries: {code:sql} BEGIN declare timestamp ts1 = select now(); DECLARE integer c = 20000; WHILE (c > 0) BEGIN c= c-1; END declare timestamp ts2 = select now(); select ts1, ts2; END ;; {code} and {code:sql} BEGIN DECLARE integer c = 20000; create local temporary table #tem(ts timestamp); WHILE (c > 0) BEGIN INSERT INTO #tem VALUES((select NOW())); c= c-1; END select * from #tem; END ;; {code} NOW() function returns the same value for each call in BEGIN...END block and it doesn't matter if it is atomic or not.