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13.1.31 DROP SPATIAL REFERENCE SYSTEM Syntax

Contents
  1. DROP SPATIAL REFERENCE SYSTEM
  2.     [IF EXISTS]
  3.     srid
  4.  
  5. srid: 32-bit unsigned integer

This statement removes a spatial reference system (SRS) definition from the data dictionary. It requires the SUPER privilege.

Example:

  1. 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 error.

If the SRID value is used by some column in an existing table, an error occurs. For example:

  1. mysql> DROP SPATIAL REFERENCE SYSTEM 4326;
  2. ERROR 3716 (SR005): Can't modify SRID 4326. There is at
  3. least one column depending on it.

To identify which column or columns use the SRID, use this query:

  1. SELECT * FROM INFORMATION_SCHEMA.ST_GEOMETRY_COLUMNS WHERE SRS_ID=4326;

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). EPSG stands for the European Petroleum Survey Group.

  • 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.


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