MySQL UPDATE with CAST/CONVERT

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I feel like this should be very simple but I can't figure out what I am doing wrong;

My query looks like this:

UPDATE table_name SET varchar_column = CAST(int_column AS VARCHAR(255)) WHERE ...

But I keep getting an error saying there is a syntax error; I also tried using CONVERT(int_column,VARCHAR(255)) but the same thing is happening?

Does anyone know why? Thanks!


CAST() does not accept VARCHAR(n) as a target type, as explained in the documentation. You can use CHAR(n) instead (or NCHAR(n) for national character set):

UPDATE table_name SET varchar_column = CAST(int_column AS CHAR(255)) WHERE ...

Note: the length of the string is optional (it is actually there only to define a maximum length for the target string).

MySQL UPDATE with CAST/CONVERT, CAST() does not accept VARCHAR(n) as a target type, as explained in the documentation. You can use CHAR(n) instead (or NCHAR(n) for� Last update on February 26 2020 08:08:28 (UTC/GMT +8 hours) MySQL BINARY Operator The BINARY operator is used to force a column comparison byte by byte rather than character by character and comparison becomes case sensitive.


MySQL will do implicit conversion, so you don't need to be explicit:

UPDATE table_name
    SET varchar_column = int_column ;

That said, explicit conversion is usually a good idea. MySQL does not take a length argument for strings.

CONVERT vs CAST in MySQL - Querychat, The CONVERT() function is the same as MySQL CAST(), explicitly changing the data type of the input to a specified target data type. Additionally, CONVERT()� The data type of the requireDate column is DATE, therefore, MySQL has to convert the literal strings: '2003-01-01' and '2003-01-31' into TIMESTAMP values before evaluating the WHERE condition. However, to be safe, you can use CAST() function to explicitly convert a string into a TIMESTAMP value as follows:


It should be cast(int_column as CHAR)

See an example

https://dbfiddle.uk/?rdbms=mysql_5.6&fiddle=ebdc64f999c507e4fc1d4d1b892a1dce

MySQL CAST() Function, This tutorial shows you how to use MySQL CAST function to convert a value of any type into a value with a specified type. Summary: in this tutorial, you will learn various functions that convert a string to a date in SQL.. Convert string to date using CAST() function. SQL provides a CAST() function that allows you to convert a string to a date.


Casting to VARCHAR is not supported. You'll need to cast to CHAR:

UPDATE table_name SET varchar_column = CAST(int_column AS CHAR) WHERE ...

See CONVERT/CAST documentation

MySQL CAST() Function, MySQL CAST() Function. ❮ MySQL Functions. Example. Convert a value to a DATE datatype: SELECT CAST(� Cast/Convert IEnumerable<T> to IEnumerable<U>? SQL, CONVERT, CAST Data Type? Converting to float: CAST vs CONVERT vs *1.0; CAST and CONVERT in T-SQL; Newbie - Errors when using CAST() and CONVERT() MySQL CAST as DATE; Cast Text to Varchar mysql; Cast then check or check then cast? [duplicate] How to convert or cast a float into its bit sequence


MySQL CONVERT() Function, The CONVERT() function converts a value into the specified datatype or character set. Tip: Also look at the CAST() function. Syntax. CONVERT(value, type). OR:. MySQL has two functions to change the data type: CAST; CONVERT; We will learn what is explicit data type casting, uses of MySQL CAST and MySQL CONVERT functions and finally what is the difference between MySQL CAST and MySQL CONVERT functions. Why Do We Need Data Type Conversion?


MySQL, The datatypes in which a given value can be converted are: DATE : It is used to convert a value to the DATE datatype. The Format returned is “� SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL And, Or, Not SQL Order By SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Sum SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL


MySQL Cast functions and Operators, The CAST() function is used to convert the type of an expression to a Last update on February 26 2020 08:08:28 (UTC/GMT +8 hours)� BINARY expr. The BINARY operator converts the expression to a binary string (a string that has the binary character set and binary collation). A common use for BINARY is to force a character string comparison to be done byte by byte using numeric byte values rather than character by character.