query-optimization

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MySQL Query Needs Optimizations

I have this users table with: id : int (255) name: char (100) last_comment_target: int(100) last_comment_date: datetime[详细]

2023-03-29 03:18 分类：问答
How to aggregate related object counts in a view effectively?

Imagine this scenario: I have three tables in my database: Products, Users and Likes, the latter representing a relation between a Product and a User. Now I have a query, which joins Products with th[详细]

2023-03-29 02:21 分类：问答
Optimizing MySQL query to avoid scanning a lot of rows

I am running an application that is using t开发者_如何学编程ablessimilar to the below tables. There are one tables for articles and there is another table for tags. I want to get the latest 30 article[详细]

2023-03-28 19:24 分类：问答
Is it necessary to consider dropping the existing index because it is a prefix of the recommended index

SQL Tuning Advisor of Oracle SQL Developer v3 suggests the following for my query: Consider running the Access Advisor to improve the physical schema[详细]

2023-03-28 16:32 分类：问答
Improve MySQL Query with IN Subquery

I hava a table items and a table item_attributes. For simplicity let\'s say my table item has a column id and a column name.[详细]

2023-03-27 23:22 分类：问答
Slow MySQL joins with inner select

The following query works, but becomes slower as the size of the sendlog table increases over time. The goal is to select a list of all subscribers from the newsletter_subscribers table which do not h[详细]

2023-03-27 20:38 分类：问答
XQUERY SQL - How to pass individual node element(s) as variables?

Is there an alternate way to pass node elements dynamically than the one shown below - ? select XMLTable.XMLCOL.query(\'//*[local-name()=sql:variable("@node")\')[详细]

2023-03-27 09:47 分类：问答
Statistics and Cardinality Estimation - Why am I seeing this result?

I came across this little issue when trying to solve a more complex problem and have gotten to the end of my rope with trying to figure the optimizer out. So, let\'s say I have a table called `MyTable[详细]

2023-03-27 08:17 分类：问答
SQL Server - Reduce number of Reads [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical andcannot be reasonably answered in its current form. For help clari[详细]

2023-03-27 07:40 分类：问答
MySql Query very slow

I run the following query on my database : SELECT e.id_dernier_fichier FROM Enfants e JOIN FichiersEnfants f[详细]

2023-03-27 07:23 分类：问答