Question : I know EXIST works better than IN for larger sub-queries because it checks each sub-query record individually and […]
Tag: exists
Determine existence in recursive working table
Question : I have a query that needs to check for existence of each input row type in another table, […]
NOT EXISTS with two subquery fields that match 2 fields in main query
Question : Background: Two different document types in a document management system. Both Doc Type A and Doc Type B […]
How to check if all elements of an array exists in a table?
Question : Lets take an array of ids of size n in the application level. for instance [132,3425,13,13,… 392] where […]
Returning data based on if another column in another table is NULL
Question : I’m trying to generate a list of data which is on completed status but has not been billed. […]
WHERE IN subquery too slow
Question : I have a FULLTEXT search on the database, with the WHERE IN condition which checks that search results […]
Sql Exists clause
Question : select * from product where productname in (select productname from product where ProductQty = 89) select * from […]
Best practice between using LEFT JOIN or NOT EXISTS
Question : Is there a best practice between using a LEFT JOIN or a NOT EXISTS format? What is benefit […]
WHERE IN subquery too slow
Question : I have a FULLTEXT search on the database, with the WHERE IN condition which checks that search results […]
EXISTS() vs EXISTS() = TRUE in Postgres
Question : Faced weird behaviour with EXISTS (also applies for NOT EXISTS) generating different execution plans for WHERE EXISTS(…) EXPLAIN […]