query-optimization

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Is it better to SELECT before JOINING?

I need to join 3 tables a,b,c and I know that only one row from the table most to the left has to appear in the end result.[详细]

2023-04-04 00:42 分类：问答
Optimizing auto-complete FULLTEXT SQL query

I have the following query which is used in order to do an auto-complete of a search box: SELECT *, MATCH (screen_name, name) AGAINST (\'+query*\' IN BOOLEAN MODE) AS SCORE[详细]

2023-04-03 22:04 分类：问答
Slow MySQL limit select [duplicate]

This question already has answers here: Closed 11 years ago. Possible Duplicate: Why does MYSQL higher LIMIT offset slow the query down?[详细]

2023-04-03 19:34 分类：问答
JPA 2 - How to cache/optimize count queries?

I have Java EE application, where I have list of groups. I want to display number of items in every group, so I do:[详细]

2023-04-03 16:41 分类：问答
sql server and statistics profile

I am starting to look at the query optimizer in SQL server 2008 and I’m particularly interested in the statistics profile that can be shown for a query. So far i understand that the result shown for[详细]

2023-04-03 13:40 分类：问答
How to use MYSQL LIMIT per person

So I have a scenario where there are 1-8 people that i need to query up to 3 things they \"liked\" per person.I have the query开发者_StackOverflow中文版 set up as[详细]

2023-04-03 13:33 分类：问答
How to optimize retrieval of most occurring values (hundreds of millions of rows)

I\'m trying to retrieve some most occurring values from a SQLite table containing a few hundreds of millions of rows.[详细]

2023-04-03 11:36 分类：问答
SQL performance on multiple id matching and a Join statement

Consider this query: SELECT DISTINCT (linkindex_tags.link_id) , links_sorted.link_title , links_sorted.link_url[详细]

2023-04-03 01:32 分类：问答
Rails Minimizing Database Load

I am relatively new to rails. I understand that rails lets you play with your database values with much ease but I am a little bit in the blind about what kind of approach is more energy efficient on[详细]

2023-04-01 19:26 分类：问答
Optimizing a category filter

This recent question had me thinking about optimizing a category filter. Suppose we wish to create a database referencing a huge number of audio tracks, with their release date and a list of wor开发[详细]

2023-04-01 16:42 分类：问答