Oracle SQL: the Essential Reference

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HEADSEP

HEADS[EP] c | ON | OFF

Defines the heading separator character.

Keywords

c: Changes the value of the heading separator character to this character.
ON: Changes the value of the heading separator character back to the default "|" and enables the head separator feature. This option is the default.
OFF: Turns off the head separator feature.

Headings are interpreted when they are defined, so subsequent changes to HEADSEP won't affect existing heading definitions.

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