I had a table with some 25000 records and 75 fields. For easier analysis i broke them down into 开发者_JAVA百科10 tables with 2500 records each. now i want to put them back together to form a single table. how do i write a query. i tried a select query like select * from (table1, table2.....) but i get error as query is too complex.
tksy
Explicitly select the field, to ensure a perfect match when you use UNION.
For example,
SELECT
FirstName,
Surname
FROM
tblCustomer1
UNION
SELECT
Name [Firstname],
Surname
FROM
tblCustomer2
Select the specific columns you want and make sure they are all named identically and contain the same data type.
select * from tableA
union
...
select * from tableN
精彩评论