PostgreSQL - Get absolute difference between azimuths (angular distance) in degrees depending on direction

cw_ccw_angle.sql

-- clockwise angular distance in degrees
CREATE OR REPLACE FUNCTION CWAngle(
  IN    sdeg FLOAT,
  IN    edeg FLOAT,
  OUT   ddeg  FLOAT
) LANGUAGE SQL AS
  $$
    SELECT
      CASE (sdeg <= edeg)
        WHEN TRUE THEN
          edeg - sdeg
        ELSE
          360.0 - sdeg + edeg
      END
    ;
  $$
;

-- counterclockwise angular distance in degrees
CREATE OR REPLACE FUNCTION CCWAngle(
  IN    sdeg FLOAT,
  IN    edeg FLOAT,
  OUT   ddeg  FLOAT
) LANGUAGE SQL AS
  $$
    SELECT 360.0 - CWAngle(sdeg, edeg);
  $$
;