To fix this, you need to use DOUBLE PRECISION instead of DOUBLE as follows: SELECT CAST ( '10.2' AS DOUBLE PRECISION) Code language: SQL (Structured Query Language) ( sql ) 4) Cast a string to a boolean example LINE 2: CAST ( '10.2' AS DOUBLE) Code language: PHP ( php ) Whoops, we got the following error message: ERROR: type "double" does not exist In the following example, we try to convert a string '10.2' into a double value: SELECT CAST ( '10.2' AS DOUBLE) Code language: SQL (Structured Query Language) ( sql ) Second, we converted 0 to October 1st 2015. This example uses the CAST to convert a string to a date: SELECT CAST ( '' AS DATE),ĬAST ( '0' AS DATE) Code language: SQL (Structured Query Language) ( sql )įirst, we converted literal string into January 1st 2015. LINE 2: CAST ( '10C' AS INTEGER) Code language: PHP ( php ) 2) Cast a string to a date example See the following example: SELECT CAST ( '10C' AS INTEGER) Code language: SQL (Structured Query Language) ( sql ) ERROR: invalid input syntax for integer: "10C" If the expression cannot be converted to the target type, PostgreSQL will raise an error. The following statement converts a string constant to an integer: SELECT CAST ( '100' AS INTEGER) Code language: SQL (Structured Query Language) ( sql ) ![]() Let’s take some examples of using the CAST operator to convert a value of one type to another. ![]() Notice that the cast syntax with the cast operator (::) is PostgreSQL-specific and does not conform to the SQL standard PostgreSQL CAST examples '0':: DATE Code language: SQL (Structured Query Language) ( sql ) See the following example: SELECT '100':: INTEGER, Then, specify the target data type to which you want to convert the result of the expression.īesides the type CAST syntax, you can use the following syntax to convert a value of one type into another: expression::type Code language: SQL (Structured Query Language) ( sql ).First, specify an expression that can be a constant, a table column, an expression that evaluates to a value.The following illustrates the syntax of type CAST: CAST ( expression AS target_type ) Code language: SQL (Structured Query Language) ( sql ) PostgreSQL provides you with the CAST operator that allows you to do this. There are many cases that you want to convert a value of one data type into another. See Data Type Precedence in SQL Server for a list of data types in order of precedence.Summary: in this tutorial, we will show you how to use PostgreSQL CAST operator to convert a value of one type to another. We’re simply converting it to decimal and adding the fractional portion. In SQL Server, decimal has a higher precedence to integer.īy multiplying it by 1.00, we’re not changing the integer portion. The operation then returns the data type of the argument with the higher precedence. In SQL Server, whenever an operator combines expressions of different data types, the data type with the lower precedence is first converted to the data type with the higher precedence. In this example, we multiply the integer by 1.00. Result: 275.00 Use an Arithmetic OperatorĪnother option is to use an arithmetic operator, such as a multiplication operator: SELECT 275 * 1.00 The CONVERT() function does the same thing as CAST(), except with a slightly different syntax: SELECT CONVERT(DECIMAL(5, 2), 275) Result: Msg 8115, Level 16, State 8, Line 1Īrithmetic overflow error converting int to data type numeric. If the precision argument isn’t large enough, an error occurs: SELECT CAST(18301275 AS DECIMAL(9, 2)) It’s important to remember to adjust the precision as required: SELECT CAST(18301275 AS DECIMAL(10, 2)) Therefore, we can adjust our example as follows to achieve the same result: SELECT CAST(275 AS NUMERIC(5, 2)) In this example, we converted an integer ( 275) to a decimal value with a precision of 5 and with 2 decimal places.ĭecimal and numeric are synonyms and can be used interchangeably. ![]() The CAST() function converts an expression of one data type to another: SELECT CAST(275 AS DECIMAL(5, 2)) Here are three options for converting an integer to a decimal value in SQL Server using T-SQL.
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