Question : I’m using Postgres 9.4, and already seen others asking the same (simple) question, but theirs answers do not […]
Category: Join
how to select query to inner join same column twice?
Question : Table A: Col1 [TicketSubject] Col2 [Createuserid] Col3 [Modifyuserid] Table B: Col1 [ID] Col2 [Name] How I imagine it […]
Slow join behaviour with ‘or’ in predicate
Question : I’m faced with a situation which I can’t understand and overcome. In short we have left-join query like: […]
SQL Server Query For Getting data in Specific Format
Question : We have two tables. One is PriceGroupTable and other is PricesTable. There is a one-to-many relationship between them. […]
Just 4 Table Join query takes too much time and some time fail to execute
Question : I am working on getting candidate detail from mysql database and for that i have created one query. […]
compare sum of one table with a field on another table
Question : I have two tables invoice and allocation. The common id is Invoice.invoice_id = Allocation.Invoice_RK The allocation table may […]
SELECT row based on range from columns in second table
Question : I want to SELECT all rows from first_table INNER JOIN second_table for values where the column in first_table […]
Distinct rows from a join
Question : I have two MySQL tables: ╔═══════════════════╗ ║ wpss_question_set ║ ╠═══════════════════╣ ║ id ║ ║ quesset ║ ╚═══════════════════╝ ╔════════════════╗ […]
Postgres not returning data on array_agg query as below
Question : The problem arise when there are no data for books in specific library. Consider a following working scenario. […]