DROP SPATIAL REFERENCE SYSTEM [IF EXISTS] srid srid: 32-bit unsigned integer
This statement removes a spatial reference system (SRS) definition
from the data dictionary. It requires the
If no SRS definition with the SRID value exists, an error occurs
IF EXISTS is specified. In that case, a
warning occurs rather than an error.
If the SRID value is used by some column, an error occurs.
SRID values must be in the range of 32-bit unsigned integers, with these restrictions:
SRID 0 is a valid SRID but cannot be used with
DROP SPATIAL REFERENCE SYSTEM.
If the value is in a reserved SRID range, a warning occurs. Reserved ranges are [0, 32767] (reserved by EPSG), [60,000,000, 69,999,999] (reserved by EPSG), and [2,000,000,000, 2,147,483,647] (reserved by MySQL).
Users should not drop SRSs with SRIDs in the reserved ranges. If system-installed SRSs are dropped, the SRS definitions may be recreated for MySQL upgrades.
DROP SPATIAL REFERENCE SYSTEM 4120;