Nov 15, 2019 · select * from foo where not test-1 OR not test-2 OR ( not test-3 and not test-4 ) Which is better? That's a very context-sensitive question. Only you can decide that. Be aware, though, that the use of NOT can affect what the optimizer can or can't do. You might get a less than optimal query plan.

Yes; Microsoft themselves recommend using <> over != specifically for ANSI compliance, e.g. in Microsoft Press training kit for 70-461 exam, "Querying Microsoft SQL Server", they say "As an example of when to choose the standard form, T-SQL supports two “not equal to” operators: <> and !=. The former is standard and the latter is not.

Oct 9, 2014 · Note from the docs: When SET ANSI_NULLS is OFF, the Equals (=) and Not Equal To (<>) comparison operators do not follow the ISO standard. A SELECT statement that uses WHERE column_name = NULL returns the rows that have null values in column_name.

I have the following query. SELECT * FROM table WHERE tester <> 'username'; I am expecting this to return all the results where tester is not the string username, But this not working. I think I am looking for the inverse of the Like operator but I am not sure? In my searches I have found solutions for numbers (that's where i got <> from), but ...

Dec 28, 2011 · Check the not null condition and empty string in SQL command is use 'is null / not null' and '!='. please try this sample pattern script: SELECT * FROM [Employee] WHERE EMail is not null -- not null check and Email != '' -- not empty check

Jul 24, 2016 · I am trying to use the "Not Equal" command in Sql but it does not seem to be working. I want to get the total count when all the 3 fields (status1, status2 and status3) are not equal to Yes. For some reason I am getting 0 records. SELECT COUNT(ID) from [maintable] WHERE status1 <> 'YES' and status2 <> 'YES' and status3 <> 'YES'

Current Query: SELECT DISTINCT Table1.Column1 FROM Table2, Table1 WHERE Table1.Column1 <> Table2.Column1 Results From Query: What happens when I try to run this query is the progress bar fills up almost immediately but then it pretty much freezes and doesn't do anything else as far as I can see.

Jun 28, 2012 · Your query is correct (on mySQL¹), don't know why would you think otherwise. ¹ <> is the SQL operator for not equal. Some implementations of it (PostgreSQL or MySQL for instance), however, accept != too. It is a good practice to always use <> to avoid problems if you ever use your code on a different database.

Nov 3, 2010 · @shanyangqu - the important part to read from that link is "this note by Scott Canaan suggests that in Oracle 10.2, they can produce different execution plans, and hence, different execution speeds" - but in the end, the effect was not proven, and several (valid, IMO) theories that would explain the observed behaviour were presented - none of which suggest …

Apr 3, 2019 · I know I can exclude these by doing a where not exists but in the actual database this would be a big table and I would prefer not to double query this. I have a work around also but I would like to know if there is a proper/better way of …