![]() 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. You can find more numeric formatting information in the PostgreSQL documentation.Summary: in this tutorial, we will show you how to use PostgreSQL CAST operator to convert a value of one type to another. Here are the most used symbols for the format: symbol The last symbol, S, specifies the use of a plus or minus sign (our number is negative, so it gets a minus). After the decimal symbol comes 99 representing two fractional digits. The D symbol specifies a decimal separator (here, a decimal point. Next, 999 indicates three more digits (800). The 9 indicates one digit (in our example, 5), G represents a digit group separator (in our example, one space indicating a group of thousands). In our example, this mask contains the symbol FM, which removes leading and trailing spaces. As you can see, the input format can be quite bizarre and complicated. The function takes two arguments: an input string to be converted to a number value (in our example ' 5 800,79-') and the format string (in our example 'FM9G999D99S').The format string describes in what format the input string containing the number is given. See the example below: Solution 3: Using TO_NUMBER() function This function takes two arguments: the string to convert and the format mask that indicates how each character in the string should be interpreted. ![]() Use the TO_NUMBER() function if you need to convert more complicated strings. The PostgreSQL database provides one more way to convert. Notice that CAST(), like the :: operator, removes additional spaces at the beginning and end of the string before converting it to a number. You can also use the standard SQL operator, CAST(), instead of the :: operator. This operator is used to convert between different data types. In our example, we converted the string ' 5800.79 ' to 5800.79 (a DECIMAL value). Use the :: operator to convert strings containing numeric values to the DECIMAL data type. Here’s the query you’d write:Īs you notice, the leading and trailing spaces were removed. Let’s convert the value in a string to a DECIMAL datatype. You’d like to convert a string to a decimal value in PostgreSQL.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |