The output authenticates that the data type of the “team_rating” column has been updated to the character type. Let’s run the “\d” command followed by table name to see the changes made to the selected table: \d team_info Select a table and run the following command to see the structure of the selected table: \d team_info Įxecute the below-given command to change the data type of the “team_rating” column from “integer” to “character”: ALTER TABLE team_infoĪLTER COLUMN team_rating TYPE VARCHAR(30) Once you are connected to the targeted database, type the “\dt” command to see the list of available tables in that database: \dt You have to follow the below-listed procedure to change the column’s data type:įirstly, open SQL SHELL and type the “\c” command followed by the database name to make a connection with the selected database: \c example new_data_type represents the altered/modified data type of the selected column.Įxample: How to Change/Modify the Column’s Type From int to text? col_name represents the column to be altered. tab_name represents a table whose column will be altered. Let’s analyze the above-given syntax step-by-step: The below-given syntax will assist you in changing the data type of any particular column: ALTER TABLE tab_nameĪLTER COLUMN col_name TYPE new_data_type How to Change/Update the Column’s Data Type in Postgres? So, without any further delay, let’s start. ![]() This blog will present a step-by-step guide on changing the column’s data type. In PostgreSQL, we can change the data type of one or more than one column using the “ALTER TABLE” and “ALTER COLUMN” commands. For example, integer to character, text to varchar, and so on. In this blog, we have learned to change/modify the data type of columns in Postgres in detail.In PostgreSQL, the “ALTER TABLE” and “ALTER COLUMN” commands, along with the TYPE Keyword, are used to change/modify the data type of a column. One thing that is to be noticed is that we can not implicitly typecast the TEXT/VARCHAR data type into the INT data type, to do this we will need a USING clause. The column whose data type is to be altered is specified after the ALTER COLUMN statement and we have to specify the new data type after the TYPE or SET DATA clause. The table that needs to be altered needs to be specified in the query. We can change/modify the data type of a column or multiple columns by making use of the ALTER statement. In this way, we can change/modify the data type of the column/columns. We can see that the data type of the “phone_number” column has been changed from VARCHAR to INT. We can verify if the data type has changed or not by executing the SELECT statement. ![]() Now the query will work fine as it will alter the table for the change in the table’s column data type as given below: We will execute the SELECT statement to see what the table “account_details” looks like and what is the data type of the “user_name” column before changing: Step 1: Check the Current Data Type of the Column Let’s alter the data type of the column “user_name” from the table “account_details”. We can change/modify the data type of a Postgres column using an ALTER command. Example 1: Change/Modify Column Type in PostgreSQL Let’s learn how we can change the data type of any column in PostgreSQL. The data type that we want the column to be modified into is to be written after the “SET DATA” or “TYPE” keywords.The “ SET DATA” or “TYPE” keyword is used to set the data type to a new one.This command is followed by the “SET DATA” or “TYPE” keyword. ![]()
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