Question : I have a table named contacts (primary key id) which is referenced by a number of other tables […]
Category: Join
Multiple Left Join Fetch Duplicate Data
Question : I am having duplicates data with this enormous query. SELECT t2.`1st_test` AS agric1, t2.`2nd_test` AS agric2, t2.exam AS […]
SQL Server : Merge and update multiple rows across columns
Question : I am trying to consolidate data in one table and merge it into another. The data in the […]
Prune unused joins
Question : I have expected that selecting from a view would not join the tables from which I don’t query […]
How to calculate the sums of two columns, when that two columns brought by join queries?
Question : I ran two queries as shown bellow; query 1: queried with JobRequiredProducts table and Product table to list […]
SQL Outer Join while conditioning on an extra column
Question : I am trying to pull up an outer join between two tables, on a specifc column “Identifier”, however, […]
Two left joins where one exists?
Question : Basically, I have table a, which has a type and type_id and want to join on either two […]
Select query with multiple joins
Question : I have the following tables: ORDERS: OrderID(VARCHAR), CreatedDate(DATETIME), QuoteID(INT), BasketID(INT) BASKETS: BasketID(NUMBER), ItemID(NUMBER) ITEMS: ItemID(NUMBER), QuoteID (NUMBER), ParcelID(NUMBER) […]
How to create the multiple sum query with joins
Question : Please consider following database: Table `invoices`: — invoice_id Table `amounts`: — amount_id invoice_id type_id amount I am trying […]
SQL Server OR operator causing massive loop join
Question : The query below is very slow (running over a minute) and I have narrowed down the issue to […]