silly question on table double

Hello gurus

This double table is a fictitious table with varchar2 (1)... my question is how it can select the many psedocolumns of the double does not exceed the space allowed to varchar2 (1)

Published by: 964145 on October 9, 2012 17:35

Hello

964145 wrote:
Why does say varchar2 (1) and we are able to select more than one character of the double... often you explain this buddy?

VARCHAR2 (1) means the same thing in the definition of double that he would return in the table definition.
Each column has a data type. The data type of the column called dummy in the double table lies be VARCHAR2.
VARCHAR2 columns always have a specified maximum length. The length of dual.dummy gets to 1.

Once more, pseudo-colonnes are independent of actual columns. You can SELECT any pseudo-column in any table, no matter what the actual columns in this table. For example, the ROWNUM Pseudo-column contains a NUMBER, but you can SELECT ROWNUM of tables (e.g. double) who do not have any number of columns.

Tags: Database

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