sql doubts

From: Gustavo Henrique <gustavoh(at)sysadmin(dot)com(dot)br>
To: pgsql-sql(at)postgresql(dot)org
Subject: sql doubts
Date: 2000-06-07 11:53:11
Message-ID: 393D660A00010ECA@barra.domain.com.br
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Could you help me ?

1- Whats the diference between TSQL and SQL ?

2- What are nested queries ?

3- I've seen people using DISTINCT, but what's ALL used for ?

Thanks very much for your attention,

Gustavo Henrique Maultasch
gustavoh(at)sysadmin(dot)com(dot)br

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