Question : Is NOT EXISTS or LEFT OUTER JOIN…IS NULL more efficient for finding records in one table that aren’t […]
Tag: if-not-exists
MySQL : LEFT JOIN not fetching required data
Question : I’m using left join in MySQL as mentioned below: SELECT Q.QUESTION_ID, school_id FROM Q_MASTER AS Q LEFT JOIN […]
MySQL: Create index If not exists
Question : Is there a way to create an index in MySQL if it does not exist? MySQL does not […]
MySQL: Create index If not exists
Question : Is there a way to create an index in MySQL if it does not exist? MySQL does not […]
Check if row exists
Question : I need to write a query that will insert a row only once, even if the query is […]
select data from table which dont have row in another table
Question : I have 2 tables. First “product” (id). Second – “product_has_option_value” (product_id, option_value_id). How can I get product ids […]
MySQL : LEFT JOIN not fetching required data
Question : I’m using left join in MySQL as mentioned below: SELECT Q.QUESTION_ID, school_id FROM Q_MASTER AS Q LEFT JOIN […]
Help filtering out records in MYSQL
Question : I hope that someone can help me. I need to search to filter out values in a database. […]
Increment value in row if it exists, otherwise create row with value?
Question : Below is the MySQL table layout that I’m working with. Basically, I’d like to increment views, watchers, and […]
MySQL: Execute CREATE TEMPORARY TABLE SELECT just one time?
Question : I want to create a temporary table with some select-data. My (strange) problem is that I have to […]
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