Select datas from multiple tables using one common table in sql server 2005 -


i have many tables , 1 common table have ids of these tables eg:

table1

| id | value |       date | --------------------------- |  1 |   200 | 25/04/2013 | |  2 |   250 | 26/05/2013 |

table2

| id | value |       date | --------------------------- |  1 |   300 | 25/05/2013 | |  2 |   100 | 12/02/2013 |

table3

| id | value |       date | --------------------------- |  1 |   500 | 5/04/2013  | |  2 |   100 | 1/01/2013  |

and 1 common table

| id |  table | tableid | ------------------------- |  1 | table1 |       1 | |  2 | table3 |       1 | |  3 | table2 |       1 | |  4 | table1 |       2 | |  5 | table2 |       2 | |  6 | table3 |       2 |

and using common table need select datas in above 3 tables eg:

output id    table   tableid   value    date 1     table1  1         200      25/04/2013 2     table3  1         500      5/04/2013 3     table2  1         300      25/05/2013 4     table1  2         250      26/05/2013 5     table2  2         100      12/02/2013 6     table3  2         100      1/01/2013

if don't want use union all can use coalesce same using left join this:

select c.*       , coalesce(t1.value, t2.value,t3.value) value      , coalesce(t1.date, t2.date,t3.date) date   common c   left join table1 t1 on c.tableid = t1.[id]    , [table] = 'table1'   left join table2 t2 on c.tableid = t2.[id]    , [table] = 'table2'   left join table2 t3 on c.tableid = t3.[id]    , [table] = 'table3' order id;

see this sqlfiddle

by way can reduce task join records using union all. given data structure have join tables anyhow.


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