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Java code:
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/**
* Êý¾Ý¿âΪ: Oracle10g
* ÏÖÔÚÓÐÒ»ÕűíÃûΪstudentµÄ±í£¬Êý¾ÝÈçÏ£º
* ID NAME AGE
* 1 A 20
* 2 B 20
* 3 C 20
* 4 X 19
* 5 Y 19
*/
/**
* ÆÚÍû½á¹û(Ò»)
* ÏÂÃæÎÒÏëͨ¹ýÒ»ÌõsqlÓï¾ä»òÕß´¢´æ¹ý³Ì ²éѯAGE=20µÄÏà¹Ø¼Ç¼
* ²éѯ½á¹ûÐèÒªÈçÏ£º(Ö»²éѯID¡¢NAMEÁоͿÉÒÔÁË)
* ID NAME
* 1,2,3 A,B,C
*/
/**
* ÆÚÍû½á¹û(¶þ)
* ×îºÃÊÇÄܲéѯ³öÕâÑùµÄ½á¹û(¸ù¾ÝAGEÀ´²é£¬ÎÒÏëµÄ»°Ó¦¸Ã»áÓÃGroup By°É)
* ID NAME
* 1,2,3 A,B,C
* 4,5 X,Y
*
*/
select wm_concat(id) "ID",wm_concat(name) "name" from student
group by age;
1.
select wm_concat(id)id,wm_concat(name)name
from student where age=20
2.
select wm_concat(id)id,wm_concat(name)name
from student
group by age
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