[Database MySQL] Exercise---Index

The writers table structure :

Field name	type of data	Primary key	Foreign key	non empty	only	Self-increasing
w_id	SMALLINT(11)	Yes	no	Yes	Yes	Yes
w_name	VARCHAR(255)	no	no	Yes	no	no
w_address	VARCHAR(255)	no	no	no	no	no
w_age	CHAR(2)	no	no	Yes	no	no
w_note	VARCHAR(255)	no	no	no	no	no

1. Create a table writers in the database, the storage engine is MyISAM, and add a unique index named UniqIdx on the w_id field while creating the table

    Step 1: Create a database

mysql> create database if not exists db2_idx character set utf8;
Query OK, 1 row affected (0.03 sec)

    Step 2: Create tables and indexes

mysql> create table writers(
    -> w_id SMALLINT(11) primary key unique auto_increment,
    -> w_name VARCHAR(255) not null,
    -> w_address VARCHAR(255),
    -> w_age  CHAR(2) not null,
    -> w_note VARCHAR(255),
    -> unique index index_id(w_id)
    -> )engine=MyISAM;
Query OK, 0 rows affected, 1 warning (0.01 sec)

 

2. Use the alter table statement to create a common index of nameIdx on the w_name field

mysql> Alter table writers add index nameIdx (w_name);
Query OK, 0 rows affected (0.00 sec)
Records: 0  Duplicates: 0  Warnings: 0

3. Use the CREATE INDEX statement to create a composite index named MultiIdx on the w_address and w_age fields

mysql> Create index MultiIdx on writers(w_address,w_age);
Query OK, 0 rows affected (0.00 sec)
Records: 0  Duplicates: 0  Warnings: 0

4. Use the create index statement to create a full-text index named FTIdex on the w_note field

mysql> Create fulltext index  FTIdex on writers(w_note);
Query OK, 0 rows affected (0.00 sec)
Records: 0  Duplicates: 0  Warnings: 0

 5. Delete the full-text index named FTIdex

mysql> Drop index FTIdex on writers;
Query OK, 0 rows affected (0.00 sec)
Records: 0  Duplicates: 0  Warnings: 0