Kombinera två tabeller, exkludera samma poster

Det verkar som att du behöver FULL OUTER JOIN och utesluta gemensamma delar. Du kan simulera det med:

SELECT T1.col_name
FROM T1 
LEFT JOIN T2
  ON T1.col_name = T2.col_name
WHERE T2.col_name IS NULL
UNION
SELECT T2.col_name
FROM T2 
LEFT JOIN T1
  ON T1.col_name = T2.col_name
WHERE T1.col_name IS NULL;

SqlFiddleDemo

╔══════════╗
║ col_name ║
╠══════════╣
║ C        ║
║ D        ║
║ E        ║
║ F        ║
║ G        ║
╚══════════╝

Mer information:Visuell representation av SQL-kopplingar

SELECT <select_list>
FROM Table_A A
FULL OUTER JOIN Table_B B
ON A.Key = B.Key
WHERE A.Key IS NULL OR B.Key IS NULL

Tyvärr MySQL stöder inte FULL OUTER JOIN så jag använde union av 2 LEFT JOIN .

Tillägg

Du kan enkelt utöka den med ytterligare kolumner.

SELECT 'T1' AS tab_name, T1.col_name, T1.col1, NULL AS col2
FROM  T1
LEFT JOIN  T2
  ON T1.col_name=  T2.col_name
WHERE T2.col_name IS NULL
UNION
SELECT 'T2' AS tab_name, T2.col_name, NULL, T2.col2
FROM  T2
LEFT JOIN  T1
  ON T1.col_name=  T2.col_name
WHERE T1.col_name IS NULL;

LiveDemo

Utdata:

╔══════════╦══════════╦══════╦═════════════════════╗
║ tab_name ║ col_name ║ col1 ║        col2         ║
╠══════════╬══════════╬══════╬═════════════════════╣
║ T1       ║ C        ║    3 ║                     ║
║ T1       ║ D        ║    4 ║                     ║
║ T2       ║ E        ║      ║ 2016-01-03 00:00:00 ║
║ T2       ║ F        ║      ║ 2016-01-02 00:00:00 ║
║ T2       ║ G        ║      ║ 2016-01-01 00:00:00 ║
╚══════════╩══════════╩══════╩═════════════════════╝