To the question "What are sql clauses?" most of the resources on internet simply provide a list of clauses and explain what they do. But I'm trying to understand in abstract terms how it is …

Apr 19, 2014 · I have one table of services. I need to merge two SELECT queries. Both have different where clauses. For example SELECT U_REGN as 'Region', COUNT(callID) as …

Jul 24, 2019 · Is there a work around to use window functions in update statement You can populate sample/original table using the code Create table #table( key1 Char(5), date1 Date, …

Aug 2, 2016 · Window functions aren't permitted in UPDATE statements because UPDATE isn't compatible with SELECT or ORDER BY. Window functions are like scoped SELECT …

Oct 16, 2020 · My colleague now responsible for SQL development says that I should never use an OR statement because it will mess up the query optimizer and ignore table indexes …

Given a table users with two fields: id and email. select id, email as electronic_mail from ( select id, email from users ) t where electronic_mail = '' Postgres complains that:

Aug 27, 2015 · Error 4108: Windowed functions can only appear in the SELECT or ORDER BY clauses Ask Question Asked 10 years, 3 months ago Modified 10 years, 3 months ago

Apr 12, 2017 · (It also seems like if SQL Server were smarter, it would execute both EXISTS clauses in parallel and let whichever one one completed first short-circuit the other.) Is there a …

Do you set an index on JOIN clauses or where clauses, or both? Ask Question Asked 13 years, 5 months ago Modified 6 months ago

Sep 22, 2015 · CTE terms (the clauses in a WITH query) are always executed in their entirety, if they're executed at all. They can't be flattened, and terms can't be pushed up or pulled down …