SQL compare two columns for same value

问题

With SQL Server 2012, I have two columns that I would like to compare. Both are on the same table, so no joins are needed.

Basically I need to compare two columns, for example scan1 and scan2 and if their value's match, then I need a 1, else 0. The results of the match would output to AS Results.

回答1:

Something like SELECT .... , CASE WHEN scan1 = scan2 THEN 1 ELSE 0 END AS is_equal FROM table1 should do the job.

回答2:

You can go like:

SELECT CASE WHEN Scan1 = Scan2 THEN 1 
       ELSE 0 END AS ColumnAlias
FROM YourTable

来源：https://stackoverflow.com/questions/20710825/sql-compare-two-columns-for-same-value