RDBMS Type: MySQL
DROP SPATIAL REFERENCE SYSTEM
srid: 32-bit unsigned integer
This statement removes a spatial reference system (SRS) definition from
the data dictionary. It requires the SUPER privilege.
DROP SPATIAL REFERENCE SYSTEM 4120;
If no SRS definition with the SRID value exists, an error occurs unless
IF EXISTS is specified. In that case, a warning occurs rather than an
If the SRID value is used by some column in an existing table, an error
occurs. For example:
mysql> DROP SPATIAL REFERENCE SYSTEM 4326;
ERROR 3716 (SR005): Can't modify SRID 4326. There is at
least one column depending on it.
To identify which column or columns use the SRID, use this query:
SELECT * FROM INFORMATION_SCHEMA.ST_GEOMETRY_COLUMNS WHERE SRS_ID=4326;
SRID values must be in the range of 32-bit unsigned integers, with
o SRID 0 is a valid SRID but cannot be used with DROP SPATIAL REFERENCE
o 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). EPSG stands for the European Petroleum Survey Group
o 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.