Bài viết khác
Relational Database Design Principle
1-1 1-n n-n https://nexwebsites.com/database/database-design/
PostgreSQL : subquery, CTE
What is subquery in PostgreSQL? In PostgreSQL, a subquery is a query that is nested inside another query. The subquery is executed first, and its results are used as input to the outer query. Subqueries can be used in various contexts, such as in the SELECT, WHERE, and HAVING clauses of a query. For example, […]
Optimize SQL : rule and todo list
Some rule and todo list to Optimize SQL REF https://www.pgmustard.com/blog/indexing-best-practices-postgresql
PostgreSQL Compound indexes
What is Compound indexes in PostgreSQL? A compound index (also known as a composite index or a multi-column index) refers to an index that is created on two or more columns of a table. It allows PostgreSQL to quickly find rows that match a query condition based on the values in multiple columns, which can […]
PostgreSQL indexing best practices
Don’t index every column If indexes are so useful, why don’t we add them to every column? There are a few good reasons, but a big one is that indexes add overhead to writes. Not only do indexes need to be kept up to date when we write to the table, but they can also […]
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