从查询结果中选择最新记录

我有下面的SQL query，它根据系统日期从3个表中提取记录。表service_request有多个记录，现在我想基于service_request表ID获取最新的行。从查询结果中选择最新记录

鉴于query，提供了12条记录，12条记录中，只有3条SR.ID是唯一的，我想在我的结果中只提取3条记录。

SELECT SR.ID, BR.SVC_PT_UDC_ID, D.UDC_ID, D.SUB_TYPE, SR.TYPE_CD, SR.SUB_TYPE_CD, BR.REQUEST_STATUS,BR.EXTNL_BILLING_REQUEST_ID,BR.INSERT_TIME 
FROM BILLING_REQUEST BR 
JOIN SERVICE_REQUEST SR 
ON BR.SVC_PT_ID = SR.SVC_PT_ID 
JOIN DEVICE D 
ON SR.DEVICE_ID = D.ID 
WHERE 
REQUEST_SRC = 'DDSWebServiceImportAdapter' 
AND TRUNC(BR.INSERT_TIME) = TRUNC(SYSDATE) -1 
AND (SR.TYPE_CD != 'Meter Service' AND SR.TYPE_CD != 'RMM');

来源

2017-06-28 user3792741

请您正在使用 – Jens

什么是你正在使用的ID的数据类型的DBMS添加标签？并且如果可能的话，添加表格的设计你使用过的其他领域。 – Divya

这是Oracle吗？如果是这样，哪个版本？从12c开始，你可以使用'FETCH FIRST'。 –

Modified question, 

Hi, 

I have below query which fetches record from 5 tables based on system date. 

BILLING_REQUEST table has 4 records for sysdate-1 and I need all of these to be present 
But SERVICE_REQUEST table gives multiple records, total 40, in my final result I need only 4 records which correspond to BILLING_REQUEST table 

TABLE STRUCTURE 

Billing Request TABLE 
ID (PK)  EXTNL_BILLING_REQUEST_ID(STRING)  SVC_PT_UDC_ID(STRING)  SVC_PT_ID(FK) STATUS INSERT_TIME(TIMESTAMP) 
-- Contains 4 records 

SVC_PT TABLE 
ID (PK)  UDC_ID(STRING) INSERT_TIME(TIMESTAMP) 
-- Contains 4 records 

SVC_PT_DEVICE_REL 
ID (PK)  SVC_PT_ID (FK)  DEVICE_ID (FK) EFF_START_TIME(TIMESTAMP) 
-- Contains 4 records 

DEVICE TABLE 
ID (PK)  UDC_ID(STRING) TYPE(STRING)  INSERT_TIME(TIMESTAMP) 
-- Contains 4 records 


SERVICE_REQUEST TABLE 
ID (PK) TYPE_CD(STRING) SUB_TYPE_CD (STRING) SVC_PT_ID(FK) DEVICE_ID (FK) 
-- Contains 40 records (only 4 unique SVC_PT_ID are present in this table, so need to fetch the 4 latest ID which corresponds to 4 unique SVC_PT_ID) 

QUERY BEING USED 
SELECT SR.ID, BR.SVC_PT_UDC_ID, D.UDC_ID, D.SUB_TYPE, 
SR.TYPE_CD, SR.SUB_TYPE_CD, 
BR.REQUEST_STATUS,BR.EXTNL_BILLING_REQUEST_ID,BR.INSERT_TIME 
FROM BILLING_REQUEST BR 
JOIN SVC_PT_DEVICE_REL SDR 
ON BR.SVC_PT_ID = SDR.SVC_PT_ID 
JOIN DEVICE D 
ON SDR.DEVICE_ID = D.ID 
JOIN SERVICE_REQUEST SR 
ON BR.SVC_PT_ID = SR.SVC_PT_ID 
WHERE 
REQUEST_SRC = 'DDSWebServiceImportAdapter' 
AND TRUNC(BR.INSERT_TIME) = TRUNC(SYSDATE) -6 
AND (SR.TYPE_CD != 'Meter Service' AND SR.TYPE_CD != 'RMM')

来源

2017-06-28 08:00:41 user3792741

从查询结果中选择最新记录

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