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赵嘉琪的博客 – 数据科学家之路

SQL select t1.* from t1,(select object id,count(1) cnt from t2 group by object id ) v where t1.object id=v.object id and t1.object id=15 ;. 8212;——————————————————-. Plan hash value: 1587605069. 8212;———————————————————————————. Id Operation Name Rows Bytes Cost (%CPU) Time. 8212;———————————————————————————. 0 SELECT STATEMENT 1 92 3 (0) 00:00:01. 1 TABLE ACCESS BY INDEX ROWID T1 1 79 2 (0) 00:00:01. 2 NESTED LOOPS 1 92 3 (0) 00:00:01. 3 VIEW 1 13 1 (0) 00:00:01. 4 HASH GROUP BY 1 13 1 (0) 00:00:01.

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赵嘉琪的博客 – 数据科学家之路 | isupermoe.com Reviews

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SQL select t1.* from t1,(select object id,count(1) cnt from t2 group by object id ) v where t1.object id=v.object id and t1.object id=15 ;. 8212;——————————————————-. Plan hash value: 1587605069. 8212;———————————————————————————. Id Operation Name Rows Bytes Cost (%CPU) Time. 8212;———————————————————————————. 0 SELECT STATEMENT 1 92 3 (0) 00:00:01. 1 TABLE ACCESS BY INDEX ROWID T1 1 79 2 (0) 00:00:01. 2 NESTED LOOPS 1 92 3 (0) 00:00:01. 3 VIEW 1 13 1 (0) 00:00:01. 4 HASH GROUP BY 1 13 1 (0) 00:00:01.

<META> KEYWORDS

1 跳至内容

2 赵嘉琪的博客

3 数据科学家之路

4 查询转换之谓语前推

5 谓语前推就是将谓语从一个内含查询块中应用到不可合并的查询块中

6 目标是运行索引的使用或者让其他对于数据集的筛选在查询中较早的进行

7 一般来讲，将不需要的数据提前的过滤掉一般是好主意

8 执行计划

9 note

10 4 count

CONTENT

Page content here

KEYWORDS ON PAGE

跳至内容,赵嘉琪的博客,数据科学家之路,查询转换之谓语前推,谓语前推就是将谓语从一个内含查询块中应用到不可合并的查询块中,目标是运行索引的使用或者让其他对于数据集的筛选在查询中较早的进行,一般来讲，将不需要的数据提前的过滤掉一般是好主意,执行计划,note,4 count,5 filter,rownum不止会禁止谓语前推还会禁止视图合并,etl无敌秘籍,oracle,于查询转换之谓语前推,留下评论,oracle sql的硬解析和软解析,ddl create drop alter,一 sql 解析过程

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赵嘉琪的博客 – 数据科学家之路 | isupermoe.com Reviews

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SQL select t1.* from t1,(select object id,count(1) cnt from t2 group by object id ) v where t1.object id=v.object id and t1.object id=15 ;. 8212;——————————————————-. Plan hash value: 1587605069. 8212;———————————————————————————. Id Operation Name Rows Bytes Cost (%CPU) Time. 8212;———————————————————————————. 0 SELECT STATEMENT 1 92 3 (0) 00:00:01. 1 TABLE ACCESS BY INDEX ROWID T1 1 79 2 (0) 00:00:01. 2 NESTED LOOPS 1 92 3 (0) 00:00:01. 3 VIEW 1 13 1 (0) 00:00:01. 4 HASH GROUP BY 1 13 1 (0) 00:00:01.

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keep VS OVER – 赵嘉琪的博客

http://isupermoe.com/2013/07/24/keep-vs-over

Min(mc) keep (DENSE RANK first ORDER BY sl) over(partition by id) id等于1的数量最小的 DENSE RANK first 为. Max(mc) keep (DENSE RANK first ORDER BY sl) over(partition by id). Min(mc) keep (DENSE RANK last ORDER BY sl) over(partition by id) id等于1的数量最大的 DENSE RANK first 为. Keep VS OVER 有1个想法. 或者说用first value和last value，结合row number实现，但是该种方式需要多次使用分析函数，而且还需要套一层SQL。于是出现了keep，该函数先可以参考如下链接 http:/ download.oracle.com/docs/cd/B19306 01/server.102/b14200/functions056.htm#SQLRF00641具体例子，假设有如下数据:. ROW or RANGE] BETWEEN AND.

2

function – 赵嘉琪的博客

http://isupermoe.com/category/db/oracle/function

Sys connect by path函数用法. Sys connect by path函数用法. Sys connect by path 函数主要作用是可以把一个父节点下的所有子节点通过某个字符进行区分，然后连接在一个列中显示. Select level ,sys connect by path( id , ‘/’ ). Start with pid= 1. Connect by prior pid = id ; / 父id=子id 正树型结构子id=父id 倒树型结构. Select level ,sys connect by path( pid, ‘/’ ). Start with pid= 1. Connect by prior pid = id ;. Sys connect by path. 于sys connect by path函数用法. Min(mc) keep (DENSE RANK first ORDER BY sl) over(partition by id) id等于1的数量最小的 DENSE RANK first 为. ROW or RANGE] BETWEEN AND.

3

ORACLE – 赵嘉琪的博客

http://isupermoe.com/tag/oracle

Sys connect by path函数用法. Sys connect by path函数用法. Sys connect by path 函数主要作用是可以把一个父节点下的所有子节点通过某个字符进行区分，然后连接在一个列中显示. Select level ,sys connect by path( id , ‘/’ ). Start with pid= 1. Connect by prior pid = id ; / 父id=子id 正树型结构子id=父id 倒树型结构. Select level ,sys connect by path( pid, ‘/’ ). Start with pid= 1. Connect by prior pid = id ;. Sys connect by path. 于sys connect by path函数用法. ROW or RANGE] BETWEEN AND. ROW or RANGE] BETWEEN start expr AND end expr. ROW or RANGE] BETWEEN start expr AND end expr. LAST ...

4

[ROW or RANGE] BETWEEN AND – 赵嘉琪的博客

http://isupermoe.com/2013/07/24/row-or-range-between-and

ROW or RANGE] BETWEEN AND. ROW or RANGE] BETWEEN start expr AND end expr. ROW or RANGE] BETWEEN start expr AND end expr. Start expr can be any one of the following. Sql expr PRECEDING or FOLLOWING. End expr can be any one of the following. Sql expr PRECEDING or FOLLOWING. SELECT empno, deptno, TO CHAR(hiredate, ‘YYYY’) YEAR,. COUNT(*) OVER (PARTITION BY TO CHAR(hiredate, ‘YYYY’). ORDER BY hiredate ROWS BETWEEN 3 PRECEDING AND 1 FOLLOWING) FROM P3 TO F1,. Oracle Optimizer CBO RBO. Sys connect by path函数用法.

5

补全产品的最近销售信息 – 赵嘉琪的博客

http://isupermoe.com/2013/07/24/补全产品的最近销售信息

8212;———–补全产品的最近销售信息. 近时间此产品的销售，想到了可以使用分析函数LAST VALUE IGNORE NULLS实现,11g的LAG也可以. SELECT DATE’2010-07-01 LEVEL-1 done date. FROM DUAL CONNECT BY LEVEL 6). SELECT product name,done date,sales,. LAST VALUE(sales IGNORE NULLS) OVER(PARTITION BY product name. ORDER BY done date) recent sales. SELECT t.product name,v1.done date,t.sales. FROM t PARTITION BY (t.product name). ON tdone date = v1.done date. ROW or RANGE] BETWEEN AND. Oracle Optimizer CBO RBO. 多表连接的三种方式详解 HASH JOIN MERGE JOIN NESTED LOOP.

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SQL select t1.* from t1,(select object id,count(1) cnt from t2 group by object id ) v where t1.object id=v.object id and t1.object id=15 ;. 8212;——————————————————-. Plan hash value: 1587605069. 8212;———————————————————————————. Id Operation Name Rows Bytes Cost (%CPU) Time. 8212;———————————————————————————. 0 SELECT STATEMENT 1 92 3 (0) 00:00:01. 1 TABLE ACCESS BY INDEX ROWID T1 1 79 2 (0) 00:00:01. 2 NESTED LOOPS 1 92 3 (0) 00:00:01. 3 VIEW 1 13 1 (0) 00:00:01. 4 HASH GROUP BY 1 13 1 (0) 00:00:01.

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