I have the following query and it\'s not working exactly as i want it to and it is really slow so i figured i\'d ask for some help.
I am trying to use the following query on a table with ~200k records in it.There are all sorts of other fields that can be filtered by, but this is a base example.
Say I have a database table T with 4 fields, A, B, C, and D.A, B, and C are the primary key.For any combination of [A, B], there is always a row where C == spaces.There may or may not be other rows wh
SELECT * FROM table WHERE col IN (1,2,3) or SELECT * F开发者_Python百科ROM table WHERE col = 1 OR col = 2 OR col = 3
first of all, sorry for the non descriptive title, I\'m just too rushed so I couldn\'t come up with a better one.
I need advises and want to share my experience about Query Optimization. This week, I found myself stuck in an interesting dilemma.
The question from quite a long time boiling in my head, that out of the following two stored procedures which one would perform better.
Is there a way in MySQL to COUNT(*) from a table where if the number is greater than x, it will stop counting there? Basically, I only want开发者_如何学JAVA to know if the number of records returned f
I have a search implemented on my site, it runs the following queries: SELECT COUNT(mov_id) AS total_things
I want to optimize this query as it is taking long to execute almost a second Here\'s the query: IF Exists(
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