Suppose you’re implementing a customer screen to store dynamic contacts for each customer. TL DR: the final query is at the end of the article, and you can check out a live example at DB Fiddle to copy & paste and play with. In this article let’s see how to update a specific value of an object inside an array with one query. But, you just created another problem: performance bottlenecks and resource waste. JSONB is a powerful tool, but it comes at some cost because you need to adapt the way you query and handle the data.Īnd it’s not rare to load the entire jsonb object into memory, transform it using your preferred programming language, and then saving it back to the database. Let’s say you decided to store data in the database as json or jsonb and discovered that you just created new problems for yourself that you didn’t have before. This write-up explained how to use the REPLACE() function in PostgreSQL with the help of examples.By Leandro Cesquini Pereira How to update objects inside JSONB arrays with PostgreSQL Photo by Jan Antonin Kolar on Unsplash How to update a specific value on a JSONB array an original string, a substring that you want to replace, and a new substring that will replace the old substring. The REPLACE() function takes three parameters i.e. The REPLACE() is a very convenient function that searches for the desired string and replaces all the appearances of that string with a new string/text. The output proves that this time the REPLACE() function replaces only one substring whose id is equal to 8. Let’s run the below-given query to verify the replaced/updated values of the bike_details table: SELECT * FROM bike_details SET bike_color = REPLACE(bike_color, 'Blue', 'Red') You can use the WHERE Clause to replace only specific occurrences as we did in the below-given example: UPDATE bike_details The output clarified that in the bike_details table, all the occurrences of the “Red” substring had been replaced with the “White” substring.Įxample #2: How to Use REPLACE() Function to Replace Specific Occurrences of a Substring Within the Table’s Column? Let’s execute the SELECT statement to see the updated table. SET bike_color = REPLACE(bike_color, 'Red', 'White') To do that, let’s execute the below query: UPDATE bike_details we need to replace the Red color with White. Suppose we have to update the bike_color column i.e. We have a table named bike_details in our database whose details are as follows: SELECT * FROM bike_details REPLACE() is a function, old_string represents a string that needs to be replaced, while the new_string is a string that will replace the old_string.Įxample #1: How to Use REPLACE() Function to Replace a Substring Within the Table’s Column? In this syntax, tab_name, and col_name represents the name of the targeted table and column, respectively. SET col_name = REPLACE(col_name, old_string, new_string) To do that, you need to follow the below syntax: UPDATE tab_name Suppose we need to replace a substring within the table’s column. How to Replace Text/String in a Table’s Column Using the REPLACE() Function The output shows that the REPLACE() method successfully replaced the “com” with “org”. Let's replace the “com” with the “org”: SELECT REPLACE ('', 'com', 'org') In this example, we replaced all the occurrences of the small “j” with the capital “J”Įxample #2: How to Replace a Substring With a new Substring Using the REPLACE() Function This example will give you a basic idea of the REPLACE() function: SELECT REPLACE 'j', 'J') it takes a string, an old_substring that needs to be replaced, and a new_substring that will replace the old_substring.Įxample#1: Basic Usage of the Postgres REPLACE() Function All three parameters are self-explanatory i.e. The basic syntax of the REPLACE() function will be as follows: REPLACE(origianl_string, old_substring, new_substring ) įrom the above snippet, you can observe that the REPLACE() function accepts three parameters. The REPLACE() is a very convenient function to search and replace all the appearances of a string with a new substring/text. How To Replace a String Using REPLACE() Function in PostgreSQL? The aim of this post is to explain the usage of REPLACE() function with the help of examples. In PostgreSQL, the REPLACE() function finds a string/substring and replaces it with a new string/substring. Replacing a record like an email, address, phone number, etc., is a very common task.
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