subquery Archives - IT Nursery

What is the difference between LATERAL JOIN and a subquery in PostgreSQL?

Since Postgres came out with the ability to do LATERAL joins, I’ve been reading up on it, since I currently do complex data ...

May 26, 2022
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Is there a performance difference between CTE , Sub-Query, Temporary Table or Table Variable?

In this excellent SO question, differences between CTE and sub-queries were discussed. I would like to specifically ask: In what circumstance is each ...

May 20, 2022
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Remove duplicate rows in MySQL

I have a table with the following fields: id (Unique) url (Unique) title company site_id Now, I need to remove rows having same ...

May 7, 2022
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updating table rows in postgres using subquery

Using postgres 8.4, My goal is to update existing table: CREATE TABLE public.dummy ( address_id SERIAL, addr1 character(40), addr2 character(40), city character(25), state ...

May 6, 2022
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What is the error “Every derived table must have its own alias” in MySQL?

I am running this query on MySQL SELECT ID FROM ( SELECT ID, msisdn FROM ( SELECT * FROM TT2 ) ); and ...

May 5, 2022
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Nested select statement in SQL Server

Why doesn’t the following work? SELECT name FROM (SELECT name FROM agentinformation) I guess my understanding of SQL is wrong, because I would ...

May 5, 2022
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MySQL Error 1093 – Can’t specify target table for update in FROM clause

I have a table story_category in my database with corrupt entries. The next query returns the corrupt entries: SELECT * FROM story_category WHERE ...

April 24, 2022
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Join vs. sub-query

I am an old-school MySQL user and have always preferred JOIN over sub-query. But nowadays everyone uses sub-query, and I hate it; I ...

April 16, 2022
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