Substring sql nvarchar value from start to first non-int character

Question

Have a numeric nvarchar values with some "extra-symbols" For example 1/2, 9/6, 14A They allways starts with number.
How can I substring this "extra-symbols" values from start to index of first non-int character? The example line must be 1, 9, 14
Something like

SUBSTRING(Value, 0, CHARINDEX(Value, /*Here must be all symbols except numbers*/))

Answer 1

Please try the query:

SELECT LEFT(ColumnName,PATINDEX('%[^0-9]%', ColumnName+'a')-1) FROM TABLE

Answer 2

Try this:

SELECT CASE PATINDEX('%[^0-9]%', ColumnName) WHEN  0 THEN ColumnName
ELSE LEFT(ColumnName,PATINDEX('%[^0-9]%', ColumnName)-1) END

Answer 3

Another option that avoids appending a character to every row in the table:

SELECT SUBSTRING(col, 1, COALESCE(NULLIF(PATINDEX('%[^0-9]%', col)-1, -1), 255)) 
  FROM dbo.mytable;