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Computing linked data from different tables in SQL

Source: Internet
Author: User
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Obtain the new data table from multiple tables, and then calculate and evaluate the fields of the new data table.

Select (Number01.N1/Number02.N2) -- get tow table_fieldsfrom (select count (. field01) as N1 from Table01 A, Table02 Bwhere. field01 = B. field02) Number01, -- like new Table (select count (B. field02) as N2from Table02 B) Number02 -- like new Table

The data requirements of multiple tables are similar to those obtained and then calculated. Every data acquisition is similar to creating a new temporary table.




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