Compare two tables and insert all records with added or removed status in 3rd table using SQL Server procedure

Question

I have table A and table B . I have to compare this tables records and insert data to table C using SQL Server procedure in below format

table A

  name
          


        

Answer 1

You should use FULL OUTER JOIN.

DECLARE @table1 TABLE(
    [name] char(1)
)
DECLARE @table2 TABLE(
    [name] char(1)
)
INSERT INTO @table1 VALUES ('A'),('B'),('C'),('D'),('E'),('F'),('G')
INSERT INTO @table2 VALUES ('A'),('B'),('Q'),('C'),('D'),('F'),('G')
SELECT 
    IIF(T1.name IS NULL,T2.name,T1.name) as 'Name',
    CASE WHEN T1.name IS NULL THEN 'newly added' WHEN T2.name IS NULL THEN 'removed' ELSE '' END as 'Status'
FROM @table1 T1
FULL OUTER JOIN @table2 T2 ON T1.name = T2.name

There ise one more possible method:

DECLARE @table1 TABLE(
    [name] char(1)
)
DECLARE @table2 TABLE(
    [name] char(1)
)
INSERT INTO @table1 VALUES ('A'),('B'),('C'),('D'),('E'),('F'),('G')
INSERT INTO @table2 VALUES ('A'),('B'),('Q'),('C'),('D'),('F'),('G')
SELECT 
    T1.name as 'Full_List',
    IIF(T2.name IS NOT NULL,'','removed') as 'Status'
FROM @table1 T1 
LEFT OUTER JOIN @table2 T2 ON T1.name = T2.name
UNION ALL
SELECT 
    T2.name,
    IIF(T1.name IS NULL,'Added','') 

FROM @table2 T2 
LEFT OUTER JOIN @table1 T1 ON T1.name = T2.name
WHERE T1.name IS NULL