Wrapping query in IF EXISTS makes it very slow
99497
IF EXISTS taking longer than embedded select statement
107937
?: Operator Vs. If Statement Performance
9687
Fastest way to determine if record exists
96246
What's quicker and better to determine if an array key exists in PHP?
4521
Is there an "exists" function for jQuery?
24009
How do I bulkify queries for directly or indirectly related records?
149623
How to improve the performance of this select query?
18575
How to 'insert if not exists' in MySQL?
52039
Does adding 'LIMIT 1' to MySQL queries make them faster when you know there will only be 1 result?
108832
Is a join optimized to a where clause at runtime?
20992
SQL not engaging parallelism for extremely large query
129160
How to create an array if an array does not exist yet?
143978
Proposal to merge tags [existdb] and [exist]
33733
How do I create a parameterized SQL query? Why Should I?
69750
MySQL check if a table exists without throwing an exception
115519
How can "set timestamp" be a slow query?
16054
Return not exists record in the table