oracle行轉列函數/通用行轉列

Oracle 10g： wm_concat 

Oracle 11g新增了函數： LISTAGG

簡單例子：

SELECT 
a.id,
wm_concat (a.remark) new_result
FROM 
tb_name a
group by 
a.id

可以配合over一起使用，具體復雜的用法可以到時再查

通用SQL：

在使用過程中發現有些oracle會存在查詢不出數據的問題，這個無解，所以找了個純sql的列轉行

SELECT feeapportion_id,
                       SUBSTR(MAX(SYS_CONNECT_BY_PATH(contract_no, ',')), 2) contract_no
                  FROM (SELECT feeapportion_id,
                               contract_no,
                               rn,
                               LEAD(rn) OVER(PARTITION BY feeapportion_id ORDER BY rn) rn1
                          FROM (SELECT feeapportion_id,
                                       contract_no,
                                       ROW_NUMBER() OVER(ORDER BY contract_no) rn
                                  FROM TH_SF_FEEAPPORTION_d))
                 START WITH rn1 IS NULL
                CONNECT BY rn1 = PRIOR rn
                 GROUP BY feeapportion_id