query performance, and syntax errors. Troubleshooting JSON column querying in PostgreSQL often requires a combination of SQL knowledge, understanding of JSON data structures, and careful query optimization. By addressing these common issues and best practices, you can improve...
To query the ARRAY data in Postgres, the SELECT statement is used. Postgres allows us to query the data of an entire array or a specific index of an array. Moreover, different built-in operators can be used to query the data from an array based on specific conditions. The built-in UNN...
DISTINCT is used to remove duplicate rows from the SELECT query and only display one unique row from result set. Examples Let’s set up a new table in PostgreSQL and use it to look at a few helpful ways that DISTINCT can remove duplicates and reveal useful information from the data. First...
We have also used like query when we have only remembered the half sting; using half string, we can find the whole string using like query in PostgreSQL. We can also use limit condition with a like query in PostgreSQL. We need to specify the case sensitive string while using like query ...
comparing dates in PostgreSQL and can be used to compare dates with timestamps. We have to compare the date using the select and update query using two different dates; after comparing the result, it will display the result using the select query and update query. It will update the rows....
We have included a column nameddummyof the data typevarchar. We will now fill it with a dummy value as well, similar to thedualtable in Oracle: insertintodualvalues('X'); Let us test if this works by running the following query, which was previously giving us an error in PostgreSQL: ...
Explore two different approaches of PostgreSQL list users in this blog: with a command-line command and with a query. Let’s learn how to list users in Postgres!
# service postgresql reload 1. Go to the directory where the logs of PostgreSQL are (comonly located in /var/lib/pgsql/data/pg_lo) and look for the lasted log file created. Below, you will find an example of a query that took more than 500ms: ...
How to kill/stop a query in PostgreSQL? First, check the running processes by executing: Copy 1SELECT*FROMpg_stat_activity2WHEREstate ='active'; Find the PID (<pid_of_the_process>) of the process you want to kill. Then, you have two options: ...
In PostgreSQL, the pg_databses catalog holds all the details regarding databases. So, you can run the SELECT query in PostgreSQL to show the list of available databases in pg_databases: SELECT datname FROM pg_database; Note:You can execute this query from pgAdmin's query tool to get the...