July 14, 2011

sqlite 3 string to integer conversion, similar to C function atoi

In sqlite3, if you have a column defined as string, but you want to use it as integer when doing comparison, you can do the following to convert it.

CAST(expr AS type)

For example: you have a column named "version", and you stored value "11" in it. Now you can convert that to integer by doing:

Select * from mytable where CAST(version as integer)>=11;

Hope this helps you.

15 comments:

  1. thank you!

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  2. thanks alot

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  3. Note that for integers, you can also do an implicit cast: "SELECT numstring + 0 FROM ...".

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  4. ¡Muchas gracias!, es justo lo que necesitaba.

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  5. thanks!!!!!!!!!

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  6. how to convert hex value to string in sqlite.

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  7. Thank you very much!

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  8. Thanks very much!! It's very useful.
    In fact, it also can be used at the ORDER BY clause:

    ORDER BY CAST("age" as integer)

    and also exist the conversion to real numeric (=float):

    ORDER BY CAST("price" as real)

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