#Sql convert string to int how to

Suppose we have to perform addition on the emp_salary column. Because we can’t perform the addition on the string data. When we executed the above query, we encountered an error. To do that, we will use the Postgres built-in function SUM(): SELECT SUM(emp_salary) Let’s say we need to perform the addition on the “emp_salary” column. You can observe that the data type of emp_salary column is text. Let’s fetch the table’s data using the SELECT query: SELECT * FROM emp_data

#Sql convert string to int how to

The output shows that the given string has been successfully converted into an integer data type.Įxample #2: How to Use CAST Operator on Table’s Data? For example, converting ‘100XYZ’ to integer type will cause an error (because XYZ can’t be converted into a number).Įxample #1: How to Use CAST Operator to Convert a String into an Integer/Number?Įxecute the below statement to cast a string value “5000” into an int data type: SELECT CAST ('5000' AS INTEGER) The CAST operator will generate an error if we try to convert an invalid expression/string into an integer. With the collaboration of the AS clause, the CAST operator will convert the given string into the integer type. In this syntax, the expression represents any numeric string. Here is the syntax for converting a string into an integer using the CAST operator in PostgreSQL: SELECT CAST ('expression' AS INTEGER) How to Convert a String/Text to an Integer Using CAST Operator? The output verifies that the given string “5000.05” has been successfully converted into a numeric type using the “::” operator. To do so, use the “::” operator as follows: SELECT '5000.05' :: DECIMAL The above syntax will convert the given string to the decimal/numeric type.Įxample: Practical Implementation of the “::” OperatorĬonsider we have to convert a string “5000.005” to a number type. Use the below syntax for the ‘string to number’ conversion using the “::” operator: SELECT 'expression' :: DECIMAL The output shows that the given string has been successfully converted into the numeric data type using the CAST operator. Let’s run the below statement to convert the string to a number using the CAST operator: SELECT CAST ('5000.005' AS DECIMAL) With the aid of AS clause, the CAST operator will convert the given string to a numeric type.Įxample: How to Use CAST Operator in Postgres? In the above syntax, the expression represents any numeric string.

How to Convert/Cast a String Into a Number Using CAST Operator?įollow the below syntax to convert a string into a decimal using the CAST operator: SELECT CAST ('expression' AS DECIMAL) To do so, we will first convert these strings into numeric data types, and then we can perform any operation on these numbers. For example, if ‘250’ and '190’ are stored as strings and we have to perform some arithmetic operations on them. To do so, firstly, we will convert the given strings into numbers. Suppose we have a numeric value residing in the string data type (i.e., numeric string), and the need of the moment is to serve number-specific processing. What is the Need for Converting a String into a Number in PostgreSQL? The objective of this write-up is to learn how to convert a string into a number using different examples. Using the TO_NUMBER(), CAST(), and “::” operator, we can convert a string into a numeric type such as an integer, double, or decimal. In PostgreSQL, the “::” operator and CAST operator are used for converting/casting one type to another.