EW适用于MySQL 5.7.7及以下版本。 | country | name | age | price | -------------------------------- | US | john | 22 | 20 | | Fran

EW适用于MySQL 5.7.7及以下版本。

| country | name | age | price |
--------------------------------
| US      | john | 22  | 20    |
| France  | Anne | 10  | 15    |
| Sweden  | Alex | 49  | 10    |

    | country | name | price | row_num |
    ------------------------------------
    | US      | john |  20   |    1    |
    | France  | Anne |  10   |    2    |
    | Sweden  | Alex |  5    |    3    |

SELECT @i:=@i+1 AS row_num, testing.country, testing.name, testing.price
FROM testing testing,(SELECT @i:=0) derivedTable
order by name

CREATE OR REPLACE view vwx (country, name, price, num_row) AS SELECT mytable.country, mytable.name, mytable.price, @i:=@i+1 AS row_number
    FROM testing testing,(SELECT @i:=0) derivedTable
    order by name;

CREATE OR REPLACE view vwx (country, name, price, num_row) AS
SELECT country, name, price, @index := @index + 1 AS num_row
FROM testing, (SELECT @index := 0) temp

CREATE TABLE testing (
  id int(11) NOT NULL DEFAULT 0,
  country varchar(255) DEFAULT NULL,
  name varchar(255) DEFAULT NULL,
  age int(11) DEFAULT NULL,
  price int(11) DEFAULT NULL,
  PRIMARY KEY (id)
);

INSERT INTO testing(id, country, name, age, price) VALUES
  (1, 'US', 'john', 22, 20),
  (2, 'France', 'Anne', 10, 15),
  (3, 'Sweden', 'Alex', 49, 10),
  (4, 'France', 'Anne', 11, 16);

SELECT
  t1.*, COUNT(*) row_num
FROM testing t1
  LEFT JOIN testing t2
    ON t2.name < t1.name OR (t2.name = t1.name AND t2.id <= t1.id)
 GROUP  BY t1.name, t1.id;

+----+---------+------+------+-------+---------+
| id | country | name | age  | price | row_num |
+----+---------+------+------+-------+---------+
|  3 | Sweden  | Alex |   49 |    10 |       1 |
|  2 | France  | Anne |   10 |    15 |       2 |
|  4 | France  | Anne |   11 |    16 |       3 |
|  1 | US      | john |   22 |    20 |       4 |
+----+---------+------+------+-------+---------+

delimiter //

CREATE FUNCTION `func_inc_var_session`() RETURNS int
    NO SQL
    NOT DETERMINISTIC
     begin
      SET @var := @var + 1;
      return @var;
     end
     //

delimiter ;

CREATE OR REPLACE VIEW myview (place, name, hour, price, counter) 
AS SELECT place, name, hour, price, func_inc_var_session() 
FROM yourtable
WHERE input_conditions_here;

CREATE OR REPLACE TEMPORARY TABLE myview (
    country VARCHAR(250), 
    name VARCHA(50), 
    price VARCHAR(50), 
    row_num int(11)
);

SET @row_num = 0;
INSERT INTO myview (country,name,price,row_num)
    SELECT @row_num:=@row_num+1 
        as country,name,price,row_num 
    FROM testing;

SELECT * FROM myview;

+---------+------+------+-------+---------+
| country | name | age  | price | row_num |
+---------+------+------+-------+---------+
| Sweden  | Alex |   49 |    10 |       1 |
| France  | Anne |   10 |    15 |       2 |
| France  | Anne |   11 |    16 |       3 |
| US      | john |   22 |    20 |       4 |
+---------+------+------+-------+---------+

CREATE DEFINER=`root`@`localhost` FUNCTION `func_inc_var_session`() RETURNS int(11)
begin
  SET @var := IFNULL(@var,0) + 1;
  return @var;
end

SELECT country, name, price, @ID := @ID + 1 AS row_num
FROM testing,
     (SELECT @ID := 0) temp

| country | name | price | row_num | ------------------------------------ | US | john | 20 | 1 | | France | Anne | 10 | 2 | | Sweden | Alex | 5 | 3 | | country | name | price | row_num | ------------------------------------ | US | john | 20 | 4 | | France | Anne | 10 | 5 | | Sweden | Alex | 5 | 6 | delimiter // CREATE FUNCTION `func_inc_var_session`(reset BIT) RETURNS int NO SQL NOT DETERMINISTIC begin IF reset THEN SET @var := 0; ELSE SET @var := IFNULL(@var,0) + 1; END IF; return @var; end // delimiter ; CREATE OR REPLACE VIEW country_view (country, name, price, row_num) AS SELECT country, name, price, func_inc_var_session(0) FROM country JOIN (SELECT func_inc_var_session(1)) r