# sql tables

Date: Thu, 11 Oct 2007 15:21:08 GMT

Message-ID: <EbrPi.13483$Da.2157_at_pd7urf1no>

(note, I changed the thread subject)

Bob Badour wrote:

> David Cressey wrote:

*> ...
*

>> An SQL DBMS manipulates tables, not relations or relational variables.

*>*

> Exactly.

I presume David could just as well have said "an SQL DBMS manipulates SQL tables". Found (finally) a copy of some draft or other of the SQL standard at http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt .

Not sure how this copy might differ from the official ones, but anyway, here's some of what it says in section 4.9 which seems to be about "Concepts":

*> 4.9 Tables
**>
**> A table is a multiset of rows. A row is a nonempty sequence of
**> values. Every row of the same table has the same cardinality and
**> contains a value of every column of that table. The i-th value in
**> every row of a table is a value of the i-th column of that table.
*

> The row is the smallest unit of data that can be inserted into a

> table and deleted from a table.

TableA:

ColumnA

1

1

Also wondering about "i-th" values in rows. Does the above also mean that

(all other things being equal)? Received on Thu Oct 11 2007 - 17:21:08 CEST