The next step is to create a trigger and tell it to call this function: 1 2 3 CREATETRIGGERxtrig BEFOREINSERTONt_temperature FOREACHROWEXECUTEPROCEDUREf_temp(); Our trigger will only fire on INSERT (shortly before it happens). What is also noteworthy here: In PostgreSQL, a trigger on a...
A query in PostgreSQL is declarative, meaning the SQL statement tells the database what data to return, but not how. PostgreSQL uses a client-server protocol when sending query text from client to server, and returns the full result no matter how many rows it contains. PostgreSQL runs q...
Under such circumstances, there comes the need forcase-insensitivequeries. The case-insensitive queries will return the search results without bothering about the case. Let’s see how can we query the case-insensitive queries in PostgreSQL. How to Write Case-Insensitive Queries in PostgreSQL? There ...
PostgreSQL trigger functions are similar to regularuser-defined functions. They are invoked when a particular database event (for example INSERT, UPDATE, DELETE) occurs. Triggers do not take any argument or parameters and return a value having a typetrigger. What are Triggers in Postgres? Trigge...
information_schema.routinesis a PostgreSQL system view containing information about database functions and procedures. Queries to this view can retrieve a list of all user-defined functions and their related details, as shown in the query below: ...
You’ll also see that these anti-patterns stem from performance concerns and that, besides the “manual” approach to improving SQL queries, you can analyze your queries also in a more structured, in-depth way by making use of some other tools that help you to see the query plan; And, ...
How to Write a Case Statement How to Use Filter to Have Multiple Counts How to Calculate Cumulative Sum-Running Total How to Query a JSON Column Redshift Basics How to Insert How to Update How to Delete Database Management How to Create a Table How to Use DISTKEY, SORTKEY and Define Col...
Learn how to find slow queries in PostgreSQL using logs and metrics. Tutorial on how to check for and fix performance issues to speed up your database.
PostgreSQL, also known as Postgres, is a free and open-source relational database management system emphasizing extensibility and SQL compliance. It was originally named POSTGRES, referring to its origins as a successor to the Ingres database developed at the University of California, Berkeley. In ...
They can be optimized using a PostgreSQL materialized view or other methods. The localhost:8000/rooms_mat_view/ endpoint returns the same information from the PostgreSQL materialized view. You can test the speed of query execution. One of the following sections describes how to do that. If you...