從第二個字段開始的表2的數據聯合兩個表

Question

我有兩個表，每個表有72列。第一個表的數據從第一列開始，第二個表的數據從第30列開始。我怎麼能在兩個表上執行一個聯合，如何在第二個表的值中爲前29列取0？

Answer 1

爲此，您必須明確寫入29列，默認值爲0（零）。

同樣你必須爲表格B中的列選擇表格A也是如此。

假設表B已經20列命名col30，col31，col32 ....... col49

你可以按照以下查詢中使用 -

select TableA. col1, 
     TableA. col2, 
     TableA. col3, 
     TableA. col4, 
     TableA. col5, 
     TableA. col6, 
     TableA. col7, 
     TableA. col8, 
     TableA. col9, 
     TableA. col10, 
     TableA. col11, 
     TableA. col12, 
     TableA. col13, 
     TableA. col14, 
     TableA. col15, 
     TableA. col16, 
     TableA. col17, 
     TableA. col18, 
     TableA. col19, 
     TableA. col20, 
     TableA. col21, 
     TableA. col22, 
     TableA. col23, 
     TableA. col24, 
     TableA. col25, 
     TableA. col26, 
     TableA. col27, 
     TableA. col28, 
     TableA. col29, 
     0  col30, 
     0  col31, 
     0  col32, 
     0  col33, 
     0  col34, 
     0  col35, 
     0  col36, 
     0  col37, 
     0  col38, 
     0  col39, 
     0  col40, 
     0  col41, 
     0  col42, 
     0  col43, 
     0  col44, 
     0  col45, 
     0  col46, 
     0  col47, 
     0  col48, 
     0  col49, 
     0  col50 
    from tableA 

union all 

select 0  col1, 
     0  col2, 
     0  col3, 
     0  col4, 
     0  col5, 
     0  col6, 
     0  col7, 
     0  col8, 
     0  col9, 
     0  col10, 
     0  col11, 
     0  col12, 
     0  col13, 
     0  col14, 
     0  col15, 
     0  col16, 
     0  col17, 
     0  col18, 
     0  col19, 
     0  col20, 
     0  col21, 
     0  col22, 
     0  col23, 
     0  col24, 
     0  col25, 
     0  col26, 
     0  col27, 
     0  col28, 
     0  col29, 
     TableB. col30, 
     TableB. col31, 
     TableB. col32, 
     TableB. col33, 
     TableB. col34, 
     TableB. col35, 
     TableB. col36, 
     TableB. col37, 
     TableB. col38, 
     TableB. col39, 
     TableB. col40, 
     TableB. col41, 
     TableB. col42, 
     TableB. col43, 
     TableB. col44, 
     TableB. col45, 
     TableB. col46, 
     TableB. col47, 
     TableB. col48, 
     TableB. col49, 
     TableB. col50 
    from TableB