问题
I am using Sybase and I am doing a select which returns me a column called "iftype", but its type is int and I need to convert into varchar. When I try to do the select without the convert function I get this error:
Error code 257, SQL state 37000: Implicit conversion from datatype 'VARCHAR' to 'INT' is not allowed. Use the CONVERT function to run this query.
I dont know how to implement the function CONVERT. Can anyone help me, please ?
回答1:
Use the convert function.
SELECT CONVERT(varchar(10), field_name) FROM table_name
回答2:
Use the STR function:
SELECT STR(field_name) FROM table_name
Arguments
float_expression
Is an expression of approximate numeric (float) data type with a decimal point.
length
Is the total length. This includes decimal point, sign, digits, and spaces. The default is 10.
decimal
Is the number of places to the right of the decimal point. decimal must be less than or equal to 16. If decimal is more than 16 then the result is truncated to sixteen places to the right of the decimal point.
source: https://msdn.microsoft.com/en-us/library/ms189527.aspx
回答3:
You can use CAST function:
SELECT CAST(your_column_name AS varchar(10)) FROM your_table_name
来源：https://stackoverflow.com/questions/19979532/convert-int-to-varchar-sql