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alter table ±íÃû add constraint ¡¡Ô¼ÊøÃû primary key (×ֶΣ©;
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alter table ±íÃû drop primary key£¨¶ÔÓÚÖ÷¼üÔ¼Êø¿ÉÒÔÖ±½ÓÓô˷½·¨£¬ÒòΪһÕűíÖÐÖ»ÓÐÒ»¸öÖ÷¼üÔ¼ÊøÃû, ×¢ÒâÈç¹ûÖ÷¼ü´Ëʱ»¹ÓÐÆäËü±íÒýÓÃʱɾ³ýÖ÷¼üʱ»á³ö´í£©
alter tbale father drop primary key cascade ; (Èç¹ûÓÐ×Ó±íÒýÓÃÖ÷¼üʱ£¬ÒªÓôËÓï·¨À´É¾³ýÖ÷¼ü,Õâʱ×Ó±í»¹´æÔÚÖ»ÊÇ×Ó±íÖеÄÍâ¼üÔ¼Êø±»¼°ÁªÉ¾³ýÁË£©
alter table ±íÃû drop constraint Ô¼ÊøÃû;
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alter table ±íÃû disable from primary key ; (Ï൱ÓÚ°ÑÒ»¸ö±íµÄÖ÷¼ü½ûÓÃ)
alter table ±íÃû enable primary key ;£¨enable ʱ»á×Ô¶¯È¥¼ì²é±íµÄ¼Ç¼ÊDz»ÊÇ·ûºÏÒªÇó,Èç¹ûÓÐÔàÊý¾Ýʱ±ØÐëÒªÏÈɾ³ýÔàÊý¾Ý²Å¿ÉÒÔ enable£©
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alter table ¡¡¡¡±íÃû drop(×Ö¶Î)
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alter table ±íÃû rename column ¾É×Ö¶ÎÃû to ÐÂ×Ö¶ÎÃû;
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update ±íÃû set ×ֶΠ£½ Öµ where Ìõ¼þ
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