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mysql> select * from mytable;
+----------+------+------------+-----------+
| name    |   | birth    | birthaddr |
+----------+------+------------+-----------+
| abccs   |f    | 1977-07-07 | china    |
| mary    |f    | 1978-12-12 | usa     |
| tom    |m    | 1970-09-02 | usa     |
+----------+------+------------+-----------+
2¡¢´´½¨µÚ¶þ¸ö±ítitle£¨°üÀ¨×÷Õß¡¢ÎÄÕ±êÌâ¡¢·¢±íÈÕÆÚ£©:
mysql> create table title(writer varchar(20) not null,
   -> title varchar(40) not null,
   -> senddate date);
   Ïò¸Ã±íÖÐÌî¼Ó¼Ç¼£¬×îºó±íµÄÄÚÈÝÈçÏ£º
mysql> select * from title;
+--------+-------+------------+
| writer | title | senddate   |
+--------+-------+------------+
| abccs | a1   | 2000-01-23 |
| mary   | b1   | 1998-03-21 |
| abccs | a2   | 2000-12-04 |
| tom   | c1   | 1992-05-16 |
| tom   | c2   | 1999-12-12 |
+--------+-------+------------+
5 rows in set (0.00sec)
3¡¢¶à±í²éѯ
   ÏÖÔÚÎÒÃÇÓÐÁËÁ½¸ö±í: mytable ºÍ title¡£ÀûÓÃÕâÁ½¸ö±íÎÒÃÇ¿ÉÒÔ½øÐÐ×éºÏ²éѯ£º
ÀýÈçÎÒÃÇÒª²éѯ×÷ÕßabccsµÄÐÕÃû¡¢ÐÔ±ð¡¢ÎÄÕ£º
mysql> SELECT name,,title from mytable,title
   -> WHERE name=writer AND name='abccs';
+-------+------+-------+
| name |   | title |
+-------+------+-------+
| abccs | f   | a1   |


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