select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database. If TYPE OF is used with a (VAR)CHAR type, its character.
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SELECT CAST('abc' AS varchar(5)) COLLATE French_CS_AS. Truncating and rounding results. When converting character or binary expressions (binary, char, nchar, nvarchar, varbinary, or varchar) to an expression of a different data type, the conversion operation could truncate the output data...
The CAST() function converts a value (of any type) into the specified datatype. Tip: See also the CONVERT() function.
As a result, they just used `NULL values to populate those columns. the real confusion is in the
The CAST() function is often used to return a value with a specified type for comparison in the WHERE, JOIN, and HAVING clauses. Let’s take a look at some examples of using the CAST() function.
SELECT CONCAT(CAST(int_col AS CHAR), char_col); CONCAT() returns NULL if any argument is NULL. A NULL parameter hides all information contained in other parameters from the result. Sometimes this is not desirable; to avoid this, you can
В данный момент у нас нет одинакового количества колонок, поэтому union надо использовать по-другому.