Oracel

Own notes:

To their common syntax:

oracel the date comparison to_date:

Field Name> to_date ( '2017-04-24 00:00:00', 'yyyy-mm-dd hh24: mi: ss')

oracel screening data table inside the two tables 1 and Table 2, some of which did not check out minus:

According to a field name to be screened, and if necessary two fields that are based on Table 1 and Table 2 two fields not screened

 SELECT 1 FROM table name field name 1
MINUS

SELECT field name 2 FROM table name 2

De-duplication, and to retain a data, a data table already, still remain:

The SELECT
DISTINCT field from table

Classified inquiry ,,

select the field name from table group by field name