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I have a column in my table, it holds values such as 100012345. The column is varchar. Now I want to compare this to similiar values in a where:
... where myColumn > '100012345'
for example. How could I do that?
Thanks!
668
If you want to compare their string values, then you should convert the integer to string before comparing (i.e. using String. valueOf() method). If you compare as integer values, then 5 is less than "123". If you compare as string values, then 5 is greater than "123".
1) By Using equals() Method It compares values of string for equality. String class provides the following two methods: public boolean equals(Object another) compares this string to the specified object. public boolean equalsIgnoreCase(String another) compares this string to another string, ignoring case.
You should not use == (equality operator) to compare these strings because they compare the reference of the string, i.e. whether they are the same object or not. On the other hand, equals() method compares whether the value of the strings is equal, and not the object itself.
Using equals() method: equals() method in the strings used to check the string value equality whether they contain the same character sequence. Using == operator: == operator used to check the reference equality of the two strings, whether they are pointing towards the same string object.
select * from your_table
where cast(your_column as signed) = 100012345
Have you tried to do it normally, like this:
... where myColumn > 100012345
That should work!, mysql automatically casts a string to number when it's in the context of a number operation. In the same way it casts a number to string if it's used in a string context. See the examples in the type conversion docs:
To cast a string to a numeric value in numeric context, you normally do not have to do anything other than to use the string value as though it were a number:
mysql> SELECT 1+'1';
-> 2
If you use a string in an arithmetic operation, it is converted to a floating-point number during expression evaluation.
If you use a number in string context, the number automatically is converted to a string:
mysql> SELECT CONCAT('hello you ',2);
-> 'hello you 2'
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