在MySQL中创建"数字表"

Question

我正在尝试在MySQL中生成一个连续数字的大表.

我只想要2列; 主键和数字列,范围为0-X,其中X非常大.约.64,000行应该这样做.我试过这段代码没有成功:

CREATE TABLE numbers (
   number           INT         NOT NULL
   CONSTRAINT XPKnumbers
      PRIMARY KEY CLUSTERED (number)
    )

INSERT INTO numbers (number) VALUES (0)

DECLARE @i          INT
SET @i = 20

WHILE 0 < @i
   BEGIN
      INSERT INTO numbers (number)
         SELECT number + (SELECT 1 + Max(number) FROM numbers)
            FROM numbers

      SET @i = @i - 1
   END

SELECT * FROM numbers

我收到此错误:

#1064 - 您的SQL语法有错误; 查看与您的MySQL服务器版本对应的手册,以便在'CONSTRAINT XPKnumbers PRIMARY KEY CLUSTERED(数字)附近使用正确的语法.在第3行插入n'

有人建议让这项工作吗？

Answer 1

您缺少分号,逗号,甚至在更正语法之后,每次只是在循环中插入一行时,从表中选择max仍然不是一个好主意.

删除它并使用http://use-the-index-luke.com/blog/2011-07-30/mysql-row-generator中的生成器:

CREATE OR REPLACE VIEW generator_16
AS SELECT 0 n UNION ALL SELECT 1  UNION ALL SELECT 2  UNION ALL 
   SELECT 3   UNION ALL SELECT 4  UNION ALL SELECT 5  UNION ALL
   SELECT 6   UNION ALL SELECT 7  UNION ALL SELECT 8  UNION ALL
   SELECT 9   UNION ALL SELECT 10 UNION ALL SELECT 11 UNION ALL
   SELECT 12  UNION ALL SELECT 13 UNION ALL SELECT 14 UNION ALL 
   SELECT 15;

CREATE OR REPLACE VIEW generator_256
AS SELECT ( ( hi.n << 4 ) | lo.n ) AS n
     FROM generator_16 lo, generator_16 hi;

CREATE OR REPLACE VIEW generator_4k
AS SELECT ( ( hi.n << 8 ) | lo.n ) AS n
     FROM generator_256 lo, generator_16 hi;

CREATE OR REPLACE VIEW generator_64k
AS SELECT ( ( hi.n << 8 ) | lo.n ) AS n
     FROM generator_256 lo, generator_256 hi;

CREATE OR REPLACE VIEW generator_1m
AS SELECT ( ( hi.n << 16 ) | lo.n ) AS n
     FROM generator_64k lo, generator_16 hi;

如果出于某种原因,你真的需要一个数字表来做:

INSERT INTO numbers(number)
SELECT n FROM generator_64k WHERE n < 64000