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What does



do? What is its use ?
 
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This query creates a cursor which contains one column and as many rows as there are in the table. Value of that column is 1 in all rows.

This is not very useful construct.

I sometimes do use constants in the select clause in more complicated circumstances, eg:

(Note: the order by 2, 3 causes ordering by second and third column of the resultset. It is useful with union operator as there could be ambiguity in column names otherwise.)
 
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