Top "Exists" questions

How can I check if an element exists in the visible DOM?

How do you test an element for existence without the use of the getElementById method? I have set up a …

javascript dom variables element exists

SQL Server: IF EXISTS ; ELSE

I have a tableA: ID value 1 100 2 101 2 444 3 501 Also TableB ID Code 1 2 Now I want to populate col = code of table B …

sql sql-server if-statement exists

MySQL > Table doesn't exist. But it does (or it should)

I changed the datadir of a MySQL installation and all the bases moved correctly except for one. I can connect …

mysql exists database-table

Only one expression can be specified in the select list when the subquery is not introduced with EXISTS

My query is as follows, and contains a subquery within it: select count(distinct dNum) from myDB.dbo.AQ where …

sql sql-server tsql exists

INSERT IF NOT EXISTS ELSE UPDATE?

I've found a few "would be" solutions for the classic "How do I insert a new record or update one …

sqlite insert exists upsert merge-conflict-resolution

How to check if mysql database exists

Is it possible to check if a (MySQL) database exists after having made a connection. I know how to check …

mysql database exists

Best way to test if a row exists in a MySQL table

I'm trying to find out if a row exists in a table. Using MySQL, is it better to do a …

sql mysql performance exists

Check if multiple strings exist in another string

How can I check if any of the strings in an array exists in another string? Like: a = ['a', 'b', …

python arrays string exists

Check if a div exists with jquery

Yes, I know this has been asked a lot. But, it confuses me, since the results on google for this …

jquery html exists

Linq select objects in list where exists IN (A,B,C)

I have a list of orders. I want to select orders based on a set of order statuses. So essentially …

c# linq list linq-to-objects exists