Check if a column contains text using SQL

Leaving database modeling issues aside. I think you can try

SELECT * FROM STUDENTS WHERE ISNUMERIC(STUDENTID) = 0

But ISNUMERIC returns 1 for any value that seems numeric including things like -1.0e5

If you want to exclude digit-only studentids, try something like

SELECT * FROM STUDENTS WHERE STUDENTID LIKE '%[^0-9]%'

Just try below script:

Below code works only if studentid column datatype is varchar

SELECT * FROM STUDENTS WHERE STUDENTID like '%Searchstring%'

Try LIKE construction, e.g. (assuming StudentId is of type Char, VarChar etc.)

  select * 
    from Students
   where StudentId like '%' || TEXT || '%' -- <- TEXT - text to contain

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