Oracle sql 写法

a_alter — Wed, 12 Sep 2012 04:57:00 GMT

本文用途：因�ؓ暂时没有旉��d��体看oracle sql的官�Ҏ��?�Q�纪录oracle的一些特�D�写法�?(不断更新)

1. with ... as ...

with querya as (select * from TB_Test)

2 case .. (when .. then) .... (when .. then) .. else ... end

SELECT FO_FULFILL_TRX_STRING.SEQUENCE_NO, AC_TYPE_ORDER.CODE, CASE

WHEN AC_TYPE_ORDER.CODE = 'SO'

THEN ( SELECT ORDER_NUMBER FROM SO_ORDER WHERE SO_ORDER.AID = FO_FULFILL_TRX_STRING.AID_ORDER_SO )

ELSE ( SELECT ORDER_NUMBER FROM PO_ORDER WHERE PO_ORDER.AID = FO_FULFILL_TRX_STRING.AID_ORDER_PO )

END ORDER_NUMBER

FROM FO_FULFILL_TRX_STRING, AC_TYPE_ORDER.CODE

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MYSQL 正则支持

select * from tb_rule_list where expression regexp '^.*\\$\\{0}\\[3].*$';

Oracle 正则函数支持

ORACLE中的支持正则表达式的函数主要�?/div>

REGEXP_LIKE �Q�与LIKE的功能相�?/div>

REGEXP_INSTR �Q�与INSTR的功能相�?/div>

REGEXP_SUBSTR �Q�与SUBSTR的功能相�?/div>

REGEXP_REPLACE �Q�与REPLACE的功能相

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在MYSQL �?select 可以昄�� 不是group by 中的分组字段�Q?可以是�Q意的数据列，具体数据昄��的是分组后的�W�一行数�?/div>

在ORACLE�?select 是严格的只能昄��group by 中的字段�?/div>

同样效果的两行sql --- 让自己注意提高自��q��使用灉|��?/div>

1. select a.aid AAid,nvl(b.cot,0) countline from po_draft_order a,(select AID_DRAFT_ORDER_PO BAID,count(*) cot from po_draft_line group by AID_DRAFT_ORDER_PO) b WHERE A.AID = B.BAID(+);

2. select a.aid, (select count(*) from po_draft_line where AID_DRAFT_ORDER_PO = a.aid ) c from po_draft_order a;

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oracle 分��

rank()/dense_rank() over(partition by ... order by ...) 加强对分�l�排序之后的数据的控制力�?/div>

over: over(...)

partition by : 相当于group by

order by e.sal desc: 按工资从高到低排序（使用rank()/dense_rank() �Ӟ��必须要带order by否则非法�Q?/div>

rank()/dense_rank(): 分��

整个语句的意思就是：在按部门划分的基��上，按工资从高到低对雇员�q�行分��Q?#8220;�U�别”�׃��到大的数字表示�Q�最��g��定�ؓ1�Q��?nbsp;

那么rank()和dense_rank()有什么区别呢�Q?/div>

rank(): 跌��排序�Q�如果有两个�W�一�U�时�Q�接下来��是�W�三�U��?/div>

dense_rank(): �q�箋排序�Q�如果有两个�W�一�U�时�Q�接下来仍然是第二��?/div>

min()/max() over(partition by ...) // 分组最大最��?/div>

lead()/lag() over(partition by order by) // 前后数据比较使用

lead(列名,n,m): 当前记录后面�W�n行记录的<列名>的��|��没有则默认��gؓm�Q�如果不带参数n,m�Q�则查找当前记录后面�W�一行的记录<列名>的��|��没有则默认��gؓnull�?/div>

lag(列名,n,m): 当前记录前面�W�n行记录的<列名>的��|��没有则默认��gؓm�Q�如果不带参数n,m�Q�则查找当前记录前面�W�一行的记录<列名>的��|��没有则默认��gؓnull�?/div>

主要是各个函数和over的配合��用�?/div>

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Oracle 的集合运��?/div>

UNION 用来合�ƈ�l�果�?要求�q�回字段是一��L��?/div>

JOIN 用来合�ƈ字段�?/div>

�q��

UNION ALL, FULL JOIN -- 重复出现

UNION, INNER JOIN minus -- 一�ơ出�?/div>

交集

intersect

差集

minus

�W�卡��积

CROSS JOIN
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INNER JOIN oracle �Ҏ��的写�?不知道在sqlserver 是否支持�?br />

SELECT
*
FROM (
SO_WEC_SODL_DESPATCH_HEADER AS SO_WEC_SODL_DESPATCH_HEADER_1
    INNER JOIN (
      (
        SO_WARRANTY_ENTITLEMENT WET_1
        INNER JOIN (SO_WARRANTY_ENTITLEMENT INNER JOIN SO_WEC_SODL
        ON SO_WARRANTY_ENTITLEMENT.AID = SO_WEC_SODL.AID_WARRANTY_ENTITLEMENT_SO
        ) ON (WET_1.AID_COMPANY = SO_WARRANTY_ENTITLEMENT.AID_COMPANY)
        AND (WET_1.SEQ_ITEM_NUM = SO_WARRANTY_ENTITLEMENT.PARENT_SEQ_ITEM)
        AND (WET_1.ITEM_LINE_NUM = SO_WARRANTY_ENTITLEMENT.PARENT_ITEM_NUM)
        AND (WET_1.SO_LINE_NUM = SO_WARRANTY_ENTITLEMENT.PARENT_SOLINE_NUM)
        AND (WET_1.SO_NUM = SO_WARRANTY_ENTITLEMENT.SO_NUM)
      )
      INNER JOIN SO_WEC_SODL AS SO_WEC_SODL_1 ON (SO_WEC_SODL.LINE_DELIVERY_NUMBER = SO_WEC_SODL_1.LINE_DELIVERY_NUMBER)
      AND (WET_1.AID = SO_WEC_SODL_1.AID_WARRANTY_ENTITLEMENT)
    ) ON SO_WEC_SODL_DESPATCH_HEADER_1.AID_WEC_SODL = SO_WEC_SODL_1.AID
) INNER JOIN SO_WEC_SODL_DESPATCH_HEADER ON SO_WEC_SODL.AID = SO_WEC_SODL_DESPATCH_HEADER.AID_WEC_SODL

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Oracle sql 写法