pl / sql创建临时全局表

Question

I am new to PL/SQL and I need to create a temp table from 3 tables and the record set be available for a report, I need the recorset only for the duration of the sesion. I would like to know what is the best way since I had heard that temporary global tables are not the best option.

• table1: fields t1.pnum, t1.dnum t1.amount, t1.c_amount
• table2: fields t2.pnum, t2.dnum t2.amount, t2.c_amount
• table3: fields t3.pnum, t3.dnum t3.amount, t3.c_amount

where table2 and table3 results union to table1 by pnum

Answer 1

You create the global temporary table as a regular schema object, not "on the fly" with PL/SQL. Then you insert into it and select from it. The data you nsert is only visible to your session, and when you either commit or disconnect or delete the data, it is gone.

However, are you sure that you need it? You can often do without a GTT in favour of Common Table Expressions (WITH clauses).