MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0

15.1.31 DROP SPATIAL REFERENCE SYSTEM Statement

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 SUPER privilege.

Example: 

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: 

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 these restrictions:

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