比较具有不同值的两个表

Question

I have two tables each in different DB on the same server...with multiple columns in SQL.

I need to fetch the records where the value of one of the column I use is present in TableA and not in TableB. This column is alphanumeric (BIGINT) in TableA while it is different in TableB it is ShortDescription(varchar(100))

TableB column's value is ONLY numbers same as Table A column but without characters (for example 123) while TableA column value can contain for example "ab123"

Now if value "abc123" in TableA is present in Table A and value "123" is not in Table B, then I should get that record from table A. If 123 is present in Table B for that column, then I shouldn't fetch.

How to do?

Answer 1

Try this query. It makes things simple by joining the two tables, then utilizing the WHERE clause. I'll just call the common column between the two tables "Id" for the join:

SELECT * FROM TableA 
LEFT JOIN TableB ON TableA.Id = TableB.Id 
WHERE TableA.Column1 = "ab123" AND TableB.ShortDescription != "123";

Answer 2

You need PATINDEX to find the numbers from TableA.Column1 and then match it with TableB.Column2. Below is the query for you:

Select Column1 FROM TableA WHERE EXISTS (SELECT 1 FROM TableB WHERE SUBSTRING(CAST(Column1 AS VARCHAR), PATINDEX('%[0-9]%', CAST(Column1 AS VARCHAR)), LEN(Column1))=Column2)

I am assuming you do not have a common column between two tables. Otherwise you can use the common column to join and put the PATINDEX statement in WHERE clause.