MySQL fulltext full-Text search detailed

MySQL tutorial full-text Search, SQL writing:
MATCH (Col1,col2,...) Against (expr [in BOOLEAN MODE | With QUERY expansion])

Like what:
SELECT * from articles WHERE MATCH (title,body) against (' database ');

The MATCH () function performs a natural language search within a database for a string. A database is 1 sets of 1 or 2 columns contained within Fulltext. The search string is given as a parameter to the against (). For each row in the table, MATCH () returns a correlation value, that is, a similarity metric between the search string and the line literal in the MATCH () table.

ALTER TABLE <table> ADD fulltext (Fields)

We could query the database using the MATCH () and against () functions.

SELECT * FROM tablename WHERE MATCH (Fields) against (' Search term ')

Mysql> CREATE TABLE Employee (
-> ID int,
-> first_name VARCHAR (15),
-> last_name VARCHAR (15),
-> start_date Date,
-> end_date Date,
-> salary FLOAT (8,2),
-> City VARCHAR (10),
-> description VARCHAR (15)
->);
Query OK, 0 rows affected (0.02 sec)

Mysql>
Mysql>
Mysql> ALTER TABLE Employee ADD Fulltext (first_name);
Query OK, 0 rows affected (0.08 sec)
records:0 duplicates:0 warnings:0

Mysql>
Mysql>
Mysql>
mysql> INSERT INTO Employee (Id,first_name, last_name, start_date, end_date, salary, city, Description)
-> values (1, ' Jason J ', ' Martin ', ' 19960725 ', ' 20060725 ', 1234.56, ' Toronto ', ' Programmer ');
Query OK, 1 row affected (0.03 sec)

Mysql>
mysql> INSERT INTO Employee (Id,first_name, last_name, start_date, end_date, salary, city, Description)
-> values (2, ' Ali J son ', ' Mathews ', ' 19760321 ', ' 19860221 ', 6661.78, ' Vancouver ', ' Tester ');
Query OK, 1 row Affected (0.00 sec)

Mysql>
mysql> INSERT INTO Employee (Id,first_name, last_name, start_date, end_date, salary, city, Description)
-> values (3, ' James ', ' Smith ', ' 19781212 ', ' 19900315 ', 6544.78, ' Vancouver ', ' Tester ');
Query OK, 1 row Affected (0.00 sec)

Mysql>
mysql> INSERT INTO Employee (Id,first_name, last_name, start_date, end_date, salary, city, Description)
-> VALUES (4, ' Celia ', ' Rice ', ' 19821024 ', ' 19990421 ', 2344.78, ' Vancouver ', ' Manager ');
Query OK, 1 row Affected (0.00 sec)

Mysql>
mysql> INSERT INTO Employee (Id,first_name, last_name, start_date, end_date, salary, city, Description)
-> values (5, ' Robert ', ' black ', ' 19840115 ', ' 19980808 ', 2334.78, ' Vancouver ', ' Tester ');
Query OK, 1 row Affected (0.00 sec)

Mysql>
mysql> INSERT INTO Employee (Id,first_name, last_name, start_date, end_date, salary, city, Description)
-> VALUES (6, ' Linda ', ' Green ', ' 19870730 ', ' 19960104 ', 4322.78, ' New York ', ' Tester ');
Query OK, 1 row affected (0.01 sec)

Mysql>
mysql> INSERT INTO Employee (Id,first_name, last_name, start_date, end_date, salary, city, Description)
-> VALUES (7, ' David ', ' Larry ', ' 19901231 ', ' 19980212 ', 7897.78, ' New York ', ' Manager ');
Query OK, 1 row Affected (0.00 sec)

Mysql>
mysql> INSERT INTO Employee (Id,first_name, last_name, start_date, end_date, salary, city, Description)
-> VALUES (8, ' James ', ' Cat ', ' 19960917 ', ' 20020415 ', 1232.78, ' Vancouver ', ' Tester ');
Query OK, 1 row Affected (0.00 sec)

Mysql>
Mysql> select * from Employee;
+------+------------+-----------+------------+------------+---------+-----------+-------------+
| ID | first_name | last_name | start_date | end_date | Salary | City | Description |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
| 1 | Jason J | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer |
| 2 | Ali J Son | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester |
| 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester |
| 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager |
| 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester |
| 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester |
| 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager |
| 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
8 rows in Set (0.00 sec)

Mysql>
Mysql>
Mysql>
Mysql>
mysql> SELECT ID, first_name
-> from Employee
-> WHERE
-> MATCH (first_name) against (' J ');
Empty Set (0.02 sec)

Mysql>
Mysql>
Mysql>
Mysql>
mysql> drop table Employee;
Query OK, 0 rows Affected (0.00 sec)

Mysql>
Mysql>

=========

Mysql>
Mysql>
Mysql>
Mysql> SELECT first_name, MATCH (first_name) against (' J ') as Rating
-> from Employee
-> WHERE MATCH (first_name) against (' J ');
Empty Set (0.00 sec)

Mysql>
Mysql>
Mysql>
Mysql>
mysql> drop table Employee;
Query OK, 0 rows Affected (0.00 sec)

Mysql>