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如下: [TEST@ORA1] SQL>with cr as( 2 select * from tab) 3 select * from cr; TNAME TABTYPE CLUSTERID ------------------------------ ------- ---------- A TABLE TEST TABLE 详细的说明请参照: http://blog.163.com/wudataoge/blog/stat...

使用WITH AS提高性能简化嵌套SQL一.WITH AS的含义 WITH AS短语,也叫做子查询部分(subquery factoring),可以让你做很多事情,定义一个SQL片断,该SQL片断会被整个SQL语句所用到。有的时候,是为了让SQL语句的可读性更高些,也有可能是在UNIO...

as 是连词所以用as时后面必须是从句,with 是介词,用with 时后面只能用名词性结构 + 非谓语动词,构成独立主格结构。 As the spring festival is approaching, I am becoming more homesick. With the spring festivsl approaching, I am becom...

with open('abc.txt','r') as f: balabalabala 等价于 try: f = open('abc.txt','r') except: pass else: balabalabala finally: f.close() 语法是不是简洁多了?

be famous for -- 因某事而出名, 例如: 空姐因拍A -- 片而出名 be famous to -- 对于...出名, 例如: 空姐对于整个世界来说都很出名 be famuse as -- 作为...而出名, 例如: 空姐作为一个女演员而世界闻名 be famous with -- 与be famous for的含...

是公用表表达式,可以理解为创建临时表。比如 WITH A AS(SELECT * FROM TABLE1) SELECT * FROM A

这个博客里有详细介绍: http://www.cnblogs.com/ebread/p/SQLServer.html

with as语法 –针对一个别名 with tmp as (select * from tb_name) –针对多个别名 with tmp as (select * from tb_name), tmp2 as (select * from tb_name2), tmp3 as (select * from tb_name3), 其实就是把一大堆重复用到的sql语句放在with as里...

end up in 以。。。告终 如: The enemy ended up in failure . end up with 以。。。结束 如:They ended up the party with a song . end up as 作为。。。结束 如:He began to work as a clerk . Two years later , he ended up as a manage...

access的查询是可以保存的,保存后可以当做视图来用。举例: 比如这么个表: 随便写个查询,统计姓张和姓李各有多少个人吧: select left(姓名,1) as 姓,count(*) as 人数 from 员工表 group by left(姓名,1)ctrl+S保存,查询名就起“查询1” 然后...

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