採摘一審rows- PostgreSQL的

Question

分組這裏的背景，我有一個組的列：

我只是想在每ACCOUNTID

類型列每次恢復之後的第一ADVANCE

所以我的結果應該與procdates的進步

2015-09-03 09:55:12.228343 
2015-09-04 23:10:42.016903 

這可能在一個查詢？

Answer 1

我對如何得到它找到了！

SELECT * FROM 
(SELECT accountid, 
    procdate, 
     type, 
     value, 
     LAG(type) OVER (ORDER BY procdate ASC) AS previousType 
    FROM transaction) w WHERE previousType = 'RECOVERY'; 

Answer 2

試試這個：

WITH CTE_PrevType 
AS (
    SELECT accountid 
     ,procdate 
     ,LAG(type, 1, NULL) OVER (
      ORDER BY procdate 
      ) AS PreviousType 
    FROM <Table_Name> 
    ) 
SELECT 
accountid 
,procdate 
,type 
,value 
FROM <Table_Name> AS TN 
INNER JOIN CTE_PrevType CPT 
    ON TN.accountid = CPT.accountid 
     AND TN.procdate = CPT.procdate 
WHERE TN.type = 'ADVANCE' 
    AND CPT.type = 'RECOVERY'