drop_index.sql

来自「AbsDataBase5.16 最新版」· SQL 代码 · 共 22 行

/*This SQL script uses Demos.abs database. 
  Please open ...\AbsoluteDatabase\Demos\Data\Demos.abs database file.
  This sample illustrates use of DROP INDEX statement.
  This SQL script contains six queries.
  First one deletes table named "developers".
  The second creates this table with 3 fields.
  Query #3 inserts some data into the table.
  The fourth creates index so that "name"+"code" combination must be unique, for field "name" sorting order is descending  and is case-insensitive. The new index is given name "UniqueName".
  The fifth query deletes index "UniqueName" from table "developers".
  The sixth query retrieves all rows from this table.*/

drop table developers;
create table developers (
  id AutoInc, 
  Code Integer, 
  Name varchar(20)
);
insert into developers (code, name) values (2, 'Janet');
create unique index UniqueName ON  developers (name desc nocase, code);
drop index developers.UniqueName;
select * from developers;