Skip to content

Tag: exists

Update query with join and where clause

I’m currently confused with a (fairly easy) update statement that I’m trying to execute on a table. The two tables are as such: Customer table has the columns Loan table has the columns I would like to update the passworddisabled attribute to true if they are registered via a specific cash register. I’ve made use of the distinct command because

Changing In to Exists in SQL – with DISTINCT

Having this one: Reading this one: Changing IN to EXISTS in SQL Tried to change it into “Exists”, but produced this and it did not work: The error is 3706: Syntax error: expected something between ‘=’ and ‘DISTINCT’ keyword. Answer You have already redundant code. Inside the IN subquery you are selecting a column from ORGHEADER, so the LEFT join

How to select rows where multiple values do not exist

Scenario: Charlie, Amy and Robert have each filled out a survey which asks the user to select all the sports they are interested in. The question is multiple choice. In the table surveyData each row represents one of the answers each user chose. so Charlie(0001) chose basketball, rugby, acrobatics and darts. I would like to select from the table all

MySQL customized exists query performance

Because of using Hibernate, I cannot write a JPA query using exists like this (I translated it to pure SQL query): So I have to write an alternative query to check existance of activated accounts. After reading several suggestions on this website, I see a replacement: My question is: Is this bad for performance, is it short circuit query. Means