MySQL Case in Select Statement with LIKE operator

Question

Is it possible to combine the CASE statement and the LIKE operator in a MySQL SELECT statement?

For Example, I am trying to query

Answer 1

Assuming the number of digits is constant, you could use something like this:

SELECT IF(digits > 919999, MOD(digits, 100), MOD(digits, 10000) FROM raw

Add 0's to match your actual number of digits.

Answer 2

Using the second form of CASE should work:

SELECT
  CASE
    WHEN digits LIKE '6901%' THEN substr(digits,4)
    WHEN digits LIKE '91%' THEN substr(digits,2)
  END as digits
FROM raw

Furthermore, you have a stray comma at the end of your SELECT.

Answer 3

Perhaps use LEFT()?

SELECT
    CASE 
      WHEN LEFT(digits, 4) = '6901' THEN substr(digits,4)
      WHEN LEFT(digits, 2) = '91' THEN substr(digits,2)
    END 
FROM raw

Should be more performant than the LIKE.

Answer 4

Try

SELECT
    CASE true
      WHEN digits LIKE "6901%" THEN substr(digits,4)
      WHEN digits LIKE "91%" THEN substr(digits,2)
    END as "digits",
FROM raw