Cast from Varchar to Int - MySQL

Cast from VARCHAR to INT - MySQL

As described in Cast Functions and Operators:

The type for the result can be one of the following values:

• BINARY[(N)]
• CHAR[(N)]
• DATE
• DATETIME
• DECIMAL[(M[,D])]
• SIGNED [INTEGER]
• TIME
• UNSIGNED [INTEGER]

Therefore, you should use:

SELECT CAST(PROD_CODE AS UNSIGNED) FROM PRODUCT

Casting varchar to int in mysql

You have to use the AS keyword for CAST.

update route set airline_id_int = cast(airline_id AS UNSIGNED)

You can use

update route set airline_id_int = cast(airline_id AS SIGNED)

as well.

why is MySQL casting varchar as integer when WHERE clause is present?

Looks like you have already figured out what was going on. In the hope to close out this question, here's a link that explains type conversion in expression evaluation: https://dev.mysql.com/doc/refman/5.5/en/type-conversion.html

When an operator is used with operands of different types, type
conversion occurs to make the operands compatible. Some conversions
occur implicitly. For example, MySQL automatically converts numbers to
strings as necessary, and vice versa.

mysql> SELECT 1+'1';
        -> 2

In your case, MySQL might be seeing arithmetic operation in the WHERE clause and performing implicit conversion to integers in that column. My recommendation is to structure the table, if possible, in a manner that numbers are in numeric column and non-numeric data is in its appropriate column. When there's mixed content, you could force the data to be character.

cast from varchar to long

As it is explained in Cast Functions and Operators, casting to BIGINT is not supported by MySql.

I guess that referencia_factura's values are too long so they can't be converted to UNSIGNED and also an implicit conversion like referencia_factura + 0 would fail.

In this case what you can do is left pad the column values with 0s up to the max length of the column which is 100 and compare them as strings to find the maximum and then trim all the leading 0s:

SELECT TRIM(LEADING '0' FROM MAX(LPAD(referencia_factura, 100, '0')))
FROM ventas; 

See the demo.

HOW select min from cast varchar to int in mysql

I think this is what you are looking for:

SELECT
  MIN(CAST(CH1 AS SIGNED)),
  MAX(CAST(CH1 AS SIGNED))
FROM t9

Working SQLFiddle here.

You have to CAST the value as SIGNED, which corresponds to INTEGER in MySQL. More information about this, here.

Convert mysql field value from varchar to int and make comparison in query

Use cast():

select t1.*
from table1 t1
left join table2 t2 on t1._id = t2.id
where t2.version='year'
and t1.field='name'
and CAST(t1.value AS UNSIGNED) > 2005

Also, you have ep.value in your query - I guessed you meant t1

How to cast a string to numeric in mysql?

Try using signed or unsigned:

SELECT CAST(example AS SIGNED) FROM mytable

I find it very strange that MySQL does not support INT in this context (or lengths on strings).

Also, in MySQL, implicit conversion is often used:

SELECT (example + 0)

MySQL convert column datatype from VARCHAR to INT

before altering your table, try to update your values.

The goal is to set a '0' value in the fields where you have empty values (which can't be converted to int)

update ip
set isp = '0' where trim(coalesce(isp, '')) = '';

If isp was not nullable, you can remove the coalesce function.

update ip 
set isp = '0' where trim(isp) = '';

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