oracle开发中用到的SQL

		
oracle开发中用到的SQL
 
查询一级类目下 2级 3级 4级 对应的数量
 
Sql代码  
SELECT temp.cname,temp.rootcid,   
(SELECT COUNT(1) FROM show_tb_category t1 WHERE t1.flag=2 AND t1.rootcid=temp.rootcid)category2,  
(SELECT COUNT(1) FROM show_tb_category t1 WHERE t1.flag=3 AND t1.rootcid=temp.rootcid)category3,  
(SELECT COUNT(1) FROM show_tb_category t1 WHERE t1.flag=4 AND t1.rootcid=temp.rootcid)category4  
FROM  
(SELECT rootcid,flag,cname FROM show_tb_category WHERE flag=1 ORDER BY cid) temp  
 
查询1,2,3,4级类目总的数量
Sql代码  
SELECT   
   SUM(CASE t.flag WHEN 1 THEN 1 ELSE 0 END) AS count1,   
   SUM(CASE t.flag WHEN 2 THEN 1 ELSE 0 END) AS count2,   
   SUM(CASE t.flag WHEN 3 THEN 1 ELSE 0 END) AS count3,   
   SUM(CASE t.flag WHEN 4 THEN 1 ELSE 0 END) AS count4,  
   COUNT(t.flag) AS counTotal    
FROM show_tb_category t   
 
						
		
	

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