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17 sty 2012 · SELECT convert(int, sum(number)/count(number)) as average, date FROM stats WHERE * GROUP BY date or. SELECT CAST(sum(number)/count(number) as INT) as average, date FROM stats WHERE * GROUP BY date
The CAST() function converts a value (of any type) into the specified datatype. Tip: See also the CONVERT() function. Syntax
To cast a string to a number, it normally suffices to use the string value in numeric context: mysql> SELECT 1+'1';-> 2 That is also true for hexadecimal and bit literals, which are binary strings by default: mysql> SELECT X'41', X'41'+0;-> 'A', 65 mysql> SELECT b'1100001', b'1100001'+0;-> 'a', 97
With CAST (expr AS type syntax, the CAST () function takes an expression of any type and produces a result value of the specified type. This operation may also be expressed as CONVERT (expr, type), which is equivalent. If expr is NULL, CAST () returns NULL.
CAST lets you convert built-in data types or collection-typed values of one type into another built-in data type or collection type. You can cast an unnamed operand (such as a date or the result set of a subquery) or a named collection (such as a varray or a nested table) into a type-compatible data type or named collection.
2 cze 2023 · The purpose of the SQL CAST function is to convert one data type to another. It allows for more functionality than the TO_NUMBER, TO_CHAR and TO_DATE functions in Oracle, and other specific data type functions, as it allows you to specify the actual data types you want to convert to, rather than just use the defaults of those functions.
25 lip 2012 · @cassi.lup: If the value in mytest.mynum is a number stored as text (e.g. "23"), then when the column is altered, it will be stored as an integer (e.g. 23). If the value is a string (e.g. "foo"), then altering the datatype to integer will change the value to 0.
