1, added
Format:
ALTER Table ranked table name column add column data type;
exemplary
ALTER Table Test4 the Add column addr text ;
2, delete
Format: ALTER Table table drop column column name; Example: ALTER Table Test4 drop column addr;
1, added
Format:
ALTER Table ranked table name column add column data type;
exemplary
ALTER Table Test4 the Add column addr text ;
2, delete
Format: ALTER Table table drop column column name; Example: ALTER Table Test4 drop column addr;