query-optimization

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How can I efficiently identify the most popular strings in a large table?

Assuming a table of 50 million last names (for example), how would one efficiently identify the top 10,000?[详细]

2023-03-18 08:21 分类：问答
Difficult MySQL Query

In our database tables we keep a number of counting columns to help reduce the number of complex look-up queries. For example, in our users table we have columns for the number of reviews written, pho[详细]

2023-03-18 07:55 分类：问答
Optimize 5 table SQL query (stores => items => words)

Tables stores (100,000 rows): id (pk), name, lat, lng, ... store_items (9,000,000 rows): store_id (fk), item_id (fk)[详细]

2023-03-18 02:33 分类：问答
How can optimize this VIEW Statement?

I have a VIEW which is SLOW. I don\'t like the VIEW Statements as there are lot of JOINS and UNION开发者_C百科.[详细]

2023-03-17 19:38 分类：问答
improve a SELECT SQL query

My data scheme is really simple, let s say it\'s about farms tableA is the main one, with an important field \"is_active\" assuming[详细]

2023-03-17 17:25 分类：问答
SQL query Optimization help

I have the the following SQL query Declare @tempcalctbl Table ( ItemId varchar(50), ItemLocation varchar(50),[详细]

2023-03-17 16:19 分类：问答
Many to one joins

Lets say I have the following tables: create table table_a ( id_a, name_a, primary_key (id_a) ); create table table_b[详细]

2023-03-17 13:37 分类：问答
query using Foreign Key property or navigation property? EF 4.1

I\'m mapping some POCO classes to an existing database with several lookup tables and I was wondering what would be the most efficient or recommended way to proceed.[详细]

2023-03-17 02:43 分类：问答
Questions regarding a optimizing a slow query (SQL included)

SELECT DISTINCT \"myapp_profile\".\"us开发者_如何学Goer_id\", \"myapp_profile\".\"name\", \"myapp_profile\".\"age\", \"auth_user\".\"id\", \"auth_user\".\"username\",[详细]

2023-03-16 14:42 分类：问答
effective counting of objects

I have 2 models: Category(models.Model): name = models.CharField(max_length=30) no_of_posts = models.IntegerField(default=0) # a denormalised field to store post count[详细]

2023-03-16 04:03 分类：问答