对于以下查询，出现＃1064错误？

Question

 CREATE TABLE IF NOT EXISTS `pset7`.`portfolio`(
`id` int(10)  unsigned NOT NULL,
`symbol` varchar(12) NOT NULL,
`shares` double(50) NOT NULL,
PRIMARY KEY (`id`)
 )ENGINE=InnoDB;

This is the error:

ERROR : #1064 - You have an error in your SQL syntax; check the manual that corresponds >to your MySQL server version for the right syntax to use near ') NOT NULL, PRIMARY KEY >( id ) )ENGINE=InnoDB AUTO_INCREMENT=8' at line 1

I don't get what syntax error is, I checked on SQL corrector?

MySQL version - 5.5.35-0ubuntu0.13.10.2

Answer 1

DOULE needs two arguments

 `shares` DOUBLE(M,D) NOT NULL

D is the number of digits that may be after the decimal point and M is the total number of digits. For more info check this out.

Ofcourse you could also use this

`shares` DOUBLE NOT NULL

indicating to the sql engine to take the default values.

Answer 2

MySQL permits a nonstandard syntax: FLOAT(M,D) or REAL(M,D) or DOUBLE PRECISION(M,D) . Here, “ (M,D) ” means than values can be stored with up to M digits in total, of which D digits may be after the decimal point. For example, a column defined as FLOAT(7,4) will look like -999.9999 when displayed. MySQL performs rounding when storing values, so if you insert 999.00009 into a FLOAT(7,4) column, the approximate result is 999.0001

So try with

CREATE TABLE `portfolio` (
  `id` int(10) NOT NULL,
  `symbol` varchar(12) DEFAULT NULL,
  `shares` double(10,5) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

Refer: http://dev.mysql.com/doc/refman/5.6/en/floating-point-types.html