如何加入表，而不用在MySQL

Question

重複第i列有兩個表：

表1（限5）：

+--------------+ 
| TF_ID  | 
+--------------+ 
| T139297_1.02 | 
| T025433_1.02 | 
| T025429_1.02 | 
| T045327_1.02 | 
| T088966_1.02 | 
+--------------+ 

表2（限5）：

+--------------+-----------+------------+-------------+ 
| TF_ID  | Family_ID | TSource_ID | DBID  | 
| T000001_1.02 | F001_1.02 | TS19_1.02 | FBgn0085089 | 
| T000002_1.02 | F002_1.02 | TS07_1.02 | AMAG_03406 | 
| T000003_1.02 | F002_1.02 | TS07_1.02 | AMAG_05299 | 
| T000004_1.02 | F002_1.02 | TS07_1.02 | AMAG_10904 | 
| T000005_1.02 | F002_1.02 | TS07_1.02 | AMAG_15258 | 
+--------------+-----------+------------+-------------+ 

我想加入兩個表TF_ID列，我試過這個：

select a.TF_ID, b.TF_ID, b.Family_ID from table1 a, table2 b where a.TF_ID=b.TF_ID; 

輸出是這樣的：

+--------------+--------------+-----------+ 
| TF_ID  | TF_ID  | Family_ID | 
+--------------+--------------+-----------+ 
| T014411_1.02 | T014411_1.02 | F070_1.02 | 
| T014431_1.02 | T014431_1.02 | F070_1.02 | 
| T014439_1.02 | T014439_1.02 | F070_1.02 | 
| T014447_1.02 | T014447_1.02 | F070_1.02 | 
| T014450_1.02 | T014450_1.02 | F070_1.02 | 

我應該怎麼做，如果我沒有什麼TF_ID科拉姆重複？ i新生數據庫，請幫助

Answer 1

只需選擇一次;你不必選擇兩次。例如：

SELECT a.TF_ID, b.Family_ID 
FROM table1 a, table2 b 
WHERE a.TF_ID=b.TF_ID; 

更妙的是，使用USING：

SELECT a.TF_ID, b.Family_ID 
FROM table1 a 
    LEFT JOIN table2 b USING (TF_ID); 

Answer 2

選擇a.TF_ID，b.Family_ID，b.TSource_ID，b.DBID 從表1一 左連接表2 B關於一個。 TF_ID = b.TF_ID;