Sub-queries return one value or list of values to the calling or main query. The query within the main query you can call it as a nested query. In my previous post, I have covered – How to Write a Subquery Quickly in SELECT Statement.
The use of WHERE (to filter rows), and DELETE a row very much common in sub-queries. So you can filter rows and delete a row. My examples will give you clear idea on how to write SQL queries. So that you can use in your projects today.
SQL WHERE and DELETE Using Sub-query
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Here are SQL queries to use the SUBSTRING function along with LOCATE function. LOCATE gives position, and SUBSTRING uses that for the start position.
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