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select if (
    (
    SELECT COUNT(1) ColumnIsThere
      FROM INFORMATION_SCHEMA.STATISTICS
     WHERE table_schema=DATABASE() 
       AND table_name='shiplocations' 
       AND COLUMN_NAME='PlantID'
    ) > 0
    ,'select 1;'
    ,'ALTER TABLE shiplocations ADD COLUMN PlantID INT(11) NOT NULL DEFAULT 0;') INTO @tmp;
PREPARE stmt1 FROM @tmp;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1;