I have this simple T-SQL query, it emits a bunch of columns from a table and also joins information from other related tables. My data model is simple. I have a scheduled event, with participants. I need to know how many participants participate in each event. My solution to this is to add a CTE … Read more
WITH y AS ( WITH x AS ( SELECT * FROM MyTable ) SELECT * FROM x ) SELECT * FROM y Does something like this work? I tried it earlier but I couldn’t get it to work. 7 Answers 7
I have a MS SQL CTE query from which I want to create a temporary table. I am not sure how to do it as it gives an Invalid Object name error. Below is the whole query for reference SELECT * INTO TEMPBLOCKEDDATES FROM ;with Calendar as ( select EventID, EventTitle, EventStartDate, EventEndDate, EventEnumDays,EventStartTime,EventEndTime, EventRecurring, … Read more
I have begun reading about Common Table Expression and cannot think of a use case where I would need to use them. They would seem to be redundant as the same can be done with derived tables. Is there something I am missing or not understanding well? Can someone give me a simple example of … Read more
In this excellent SO question, differences between CTE and sub-queries were discussed. I would like to specifically ask: In what circumstance is each of the following more efficient/faster? CTE Sub-Query Temporary Table Table Variable Traditionally, I’ve used lots of temp tables in developing stored procedures – as they seem more readable than lots of intertwined … Read more
