使用程序比较oracle sql服务器中每列的两个表

Question

I Need a procedure to compare two tables of same schema but diffe.net data

Table 1: dep_name,emp_name,sal
Table 2: dep_name,emp_name,sal,status

Answer 1

Here's one option (sample data in lines #1 - 10).

(Though, I'm not sure you know which database you use. Is it Oracle or Microsoft SQL Server? I presumed it is Oracle. Also, screenshot doesn't support what you described - there's no status column in table 2, but it exists in table 3 which is - I presume (again) - result you want).

SQL> with
  2  t1 (dep_name, emp_name, sal) as
  3    (select 'Public', 'xxxx', 20000 from dual union all
  4     select 'Drug'  , 'yyyy', 20000 from dual
  5    ),
  6  t2 (dep_name, emp_name, sal) as
  7    (select 'Drug'  , 'yyyy', 10000 from dual union all
  8     select 'Public', 'xxxx', 20000 from dual union all
  9     select 'Police', 'zzzz', 40000 from dual
 10    )
 11  select b.dep_name, b.emp_name, greatest(nvl(a.sal, 0), nvl(b.sal, 0)) sal,
 12    case when a.sal  = b.sal then 'Matched'
 13         when a.sal <> b.sal then 'Unmatched'
 14         else 'New'
 15    end status
 16  from t2 b left join t1 a on a.dep_name = b.dep_name
 17                          and a.emp_name = b.emp_name;

DEP_NA EMP_        SAL STATUS
------ ---- ---------- ---------
Public xxxx      20000 Matched
Drug   yyyy      20000 Unmatched
Police zzzz      40000 New

SQL>