Oracle 外連接兩種寫法的一個例子

 

 

1. 用(+)表示  -- (+)風格

 

 

SELECT 

TARGET_TABLE.DATASOURCE_NUM_ID, 

TARGET_TABLE.INTEGRATION_ID 

FROM

X_SRV_CON_LINE_F TARGET_TABLE, X_SRV_CON_LINE_D_PE PE_STAGE_TABLE

WHERE

TARGET_TABLE.INTEGRATION_ID = PE_STAGE_TABLE.INTEGRATION_ID(+) AND

TARGET_TABLE.DATASOURCE_NUM_ID = PE_STAGE_TABLE.DATASOURCE_NUM_ID(+)AND 

PE_STAGE_TABLE.INTEGRATION_ID IS NULL AND 

PE_STAGE_TABLE.DATASOURCE_NUM_ID IS NULL AND

TARGET_TABLE.DELETE_FLG = 'N' and

TARGET_TABLE.CREATED_ON_DT > TO_DATE('20090424','YYYYMMDD')

 

 

2. 在FROM中用關鍵詞'LEFT OUTER JOIN' -- ANSI 風格

 

 

SELECT 

TARGET_TABLE.DATASOURCE_NUM_ID, 

TARGET_TABLE.INTEGRATION_ID 

FROM

X_SRV_CON_LINE_F TARGET_TABLE LEFT OUTER JOIN X_SRV_CON_LINE_D_PE PE_STAGE_TABLE ON 

TARGET_TABLE.INTEGRATION_ID = PE_STAGE_TABLE.INTEGRATION_ID AND

TARGET_TABLE.DATASOURCE_NUM_ID = PE_STAGE_TABLE.DATASOURCE_NUM_ID

WHERE

PE_STAGE_TABLE.INTEGRATION_ID IS NULL AND 

PE_STAGE_TABLE.DATASOURCE_NUM_ID IS NULL AND

TARGET_TABLE.DELETE_FLG = 'N' AND 

TARGET_TABLE.CREATED_ON_DT > TO_DATE('20090424','YYYYMMDD')