涓轟簡楠岃瘉浣犵殑琛ㄦ槸鎸変綘鏈熸湜鐨勬柟寮忓垱寤猴紝浣跨敤涓涓狣ESCRIBE璇彞錛?/p>
mysql> DESCRIBE pet;
+---------+-------------+------+-----+---------+-------+
| Field聽聽 | Type聽聽聽聽聽聽聽 | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+-------+
| name聽聽聽 | varchar(20) | YES聽 |聽聽聽聽 | NULL聽聽聽 |聽聽聽聽聽聽 |
| owner聽聽 | varchar(20) | YES聽 |聽聽聽聽 | NULL聽聽聽 |聽聽聽聽聽聽 |
| species | varchar(20) | YES聽 |聽聽聽聽 | NULL聽聽聽 |聽聽聽聽聽聽 |
| sex聽聽聽聽 | char(1)聽聽聽聽 | YES聽 |聽聽聽聽 | NULL聽聽聽 |聽聽聽聽聽聽 |
| birth聽聽 | date聽聽聽聽聽聽聽 | YES聽 |聽聽聽聽 | NULL聽聽聽 |聽聽聽聽聽聽 |
| death聽聽 | date聽聽聽聽聽聽聽 | YES聽 |聽聽聽聽 | NULL聽聽聽 |聽聽聽聽聽聽 |
+---------+-------------+------+-----+---------+-------+
浣犲彲浠ラ殢鏃朵嬌鐢―ESCRIBE錛屼緥濡傦紝濡傛灉浣犲繕璁拌〃涓殑鍒楃殑鍚嶇О鎴栫被鍨嬫椂銆?/p>
2.DISTINCT
璇鋒敞鎰忚鏌ヨ鍙槸綆鍗曞湴媯绱㈡瘡涓褰曠殑owner鍒楋紝騫朵笖浠栦滑涓殑涓浜涘嚭鐜板嬈°?br />涓轟簡浣胯緭鍑哄噺鍒版渶灝戯紝澧炲姞鍏抽敭瀛桪ISTINCT媯绱㈠嚭姣忎釜鍞竴鐨勮緭鍑鴻褰曪細
mysql> SELECT DISTINCT owner FROM pet;
3.ORDER BY
浣犲彲鑳藉凡緇忔敞鎰忓埌鍓嶉潰鐨勪緥瀛愪腑緇撴灉琛屾病鏈変互鐗瑰畾鐨勯『搴忔樉紺恒?br />鐒惰岋紝褰撹鎸夋煇縐嶆柟寮忔帓搴忔椂錛屾鏌ユ煡璇㈣緭鍑洪氬父鏇村鏄撱?br />涓轟簡鎺掑簭緇撴灉錛屼嬌鐢∣RDER BY瀛愬彞銆?/p>
mysql> SELECT name, birth FROM pet ORDER BY birth;
榛樿鎺掑簭鏄崌搴廇SC錛屾渶灝忕殑鍊煎湪絎竴銆傝鎯充互闄嶅簭鎺掑簭錛?br />鍦ㄤ綘姝ｅ湪鎺掑簭鐨勫垪鍚嶄笂澧炲姞DESC錛堥檷搴忥級鍏抽敭瀛?/p>
mysql> SELECT name, birth FROM pet ORDER BY birth DESC;
4.GROUP BY
浣跨敤GROUP BY瀵規瘡涓猳wner鐨勬墍鏈夎褰曞垎緇?br />COUNT( )鍜孏ROUP BY浠ュ悇縐嶆柟寮忓垎綾諱綘鐨勬暟鎹備笅鍒椾緥瀛愭樉紺哄嚭榪涜鍔ㄧ墿鏅煡鎿嶄綔鐨勪笉鍚屾柟寮忋?/p>
姣忕鍔ㄧ墿鐨勬暟閲忥細
mysql> SELECT species, COUNT(*) FROM pet GROUP BY species;
聽
]]>
Enter password: ********
鏂紑鏈嶅姟鍣?br />mysql> \q
鏌ヨ鐗堟湰鍙峰拰褰撳墠鏃ユ湡
mysql> SELECT VERSION(), CURRENT_DATE;
+----------------------+--------------+
| VERSION()聽聽聽聽聽聽聽聽聽聽聽 | CURRENT_DATE |
+----------------------+--------------+
| 5.0.24a-community-nt | 2006-10-18聽聽 |
+----------------------+--------------+
涓嶅繀鍏ㄥ湪涓涓鍐呯粰鍑轟竴涓懡浠わ紝杈冮暱鍛戒護鍙互杈撳叆鍒板涓涓?br />mysql> select user()
聽聽聽聽聽聽聽 聽-> ,
聽聽聽聽聽聽聽 ->current_date;
+----------------+--------------+
| user()聽聽聽聽聽聽聽聽 | current_date |
+----------------+--------------+
| root@localhost | 2006-10-18聽聽 |
+----------------+--------------+
濡傛灉浣犲喅瀹氫笉鎯蟲墽琛屾鍦ㄨ緭鍏ヨ繃紼嬩腑鐨勪竴涓懡浠わ紝杈撳叆\c鍙栨秷瀹冿細
mysql> select
聽聽聽聽聽聽 -> user()
聽聽聽聽聽聽 -> \c
mysql>
聽
]]>