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Luis Rodriguez wrote:
I was checking a SQL sentence with Visual Explain and the Index
Advisor suggested an index with two columns, the first one being
*SUBQJ0001 (The second column already exists as an index)
Does anyone have an idea what this refers to?
The *XXXYY#### field names are internal naming for the database
query engine, generally representative of an expression; i.e. any
specific column name does not describe the derivation. The prefix
SUBQ indicates the internal field is used to implement a subquery;
possibly the J indicates a join [implementation] column of the
subquery. The debug messages utilize similar naming prefixed with
an asterisk, to indicate that the /column/ included in the advised
or created-as temporary index was a derived expression; e.g. CPI432F
& CPI4321 as I recall, where the latter mentions specifically the
naming *MAP to indicate a derived field as result of an expression.
Regards, Chuck
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