For my part, when I designed my programming language, I intentionally did not use single-letter names for any keywords or reserved words or system-defined entities etc, and all built-ins were either 2+ letters or were symbols. As a result, single-letter names are available/reserved for end users as barewords to name their own (presumably narrow-lexical-scope) stuff, without having to guess which letters they may use. -- Darren Duncan

On 2017-09-22 8:05 AM, Murtuza Zabuawala wrote:
The characters which are in purple colour are are valid SQL keywords hence
highlighted by CodeMirror :-)
Ref: https://www.postgresql.org/docs/10/static/sql-keywords-appendix.html

    On Fri, Sep 22, 2017 at 1:53 PM, Hibbard, Brandon
    wrote:

        I have a quick question on the code highlighting.  I often use a single
        character as an alias for tables in joins.  I have noticed that some
        letters are colored purple while others are black.  Is there a reason
        for this?  I have attached an image showing what I mean.  The image was
        taken from version 2.0-rc2.


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