带有 enum('a','b','c') 的 'a' 附近的语法不正确

Question

CREATE TABLE ec_recurring 
(   
    [recurring id] int NOT NULL IDENTITY,   
    [price] decimal(10,4) NOT NULL,
    [frequency] enum('day','week','semi_month','month','year') NOT NULL,   
    [duration] cast(10 as int) unsigned NOT NULL,
    [cycle] cast(10 as int) unsigned NOT NULL,
    [trial status] tinyint(4) NOT NULL,
    [trial price] decimal(10,4) NOT NULL,
    [trial frequency] enum('day','week','semi_month','month','year') NOT NULL,   
    [trial duration] cast(10 as int) unsigned NOT NULL,
    [trial cycle] cast(10 as int) unsigned NOT NULL,
    [status] tinyint(4) NOT NULL,   
    [sort order] cast(11 as int) NOT NULL,
    [date created] datetime2 NOT NULL,   
    [date modified] datetime2 NOT NULL,
    [created by] varchar(20) NOT NULL,   
    [modified by] varchar(20) NOT NULL,
    [active] tinyint(4) NOT NULL,   

    PRIMARY KEY ([recurring id])
) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=utf8; 

这是我的代码。为什么这个错误会在接近白天和投射时发生？

消息 102，第 15 级，状态 1，第 3922 行
“day”附近的语法不正确

Answer 1

在微软的SQL Server中没有enum这样的东西，它来自MySql，但是你可以使用它的等价物：

mycol VARCHAR(10) NOT NULL CHECK (mycol IN('Useful', 'Useless', 'Unknown'))

Original Post

Answer 2

如果说的是T-SQL，那么day附近的错误说明语法不正确（就是T-SQL中没有enum关键字），应该是这样的：

[frequency] VARCHAR(10) NOT NULL,
CONSTRAINT ck_Enum CHECK ([frequency] IN('day','week','semi_month','month','year')), 

考虑到您在错误上下文中使用 cast 的第二个错误，SQL 不知道列的类型。我相信你想写：

[duration] INT DEFAULT 10 NOT NULL 
CONSTRAINT ck_Duration CHECK ([duration] > 0), 

额外检查持续时间是否无符号。你应该遵守语言的语法，因为你有更多的错误。举个例子：

CREATE TABLE ec_recurring 
( 
[recurring id]      INT IDENTITY NOT NULL
CONSTRAINT pl_recId PRIMARY KEY, 

[price]             DECIMAL(10, 4) NOT NULL,

[frequency]         VARCHAR(10) NOT NULL,
CONSTRAINT ck_Enum CHECK ([frequency] IN('day','week','semi_month','month','year')), 

[duration]          INT DEFAULT 10 NOT NULL 
CONSTRAINT ck_Duration CHECK ([duration] > 0), 

[cycle]             INT DEFAULT 10 NOT NULL 
CONSTRAINT ck_Cycle CHECK ([cycle] > 0), 

[trial status]      TINYINT DEFAULT 4 NOT NULL, 

[trial price]       DECIMAL(10, 4) NOT NULL, 

[trial frequency]   VARCHAR(10) NOT NULL 
CONSTRAINT ck_TrialEnum CHECK ([trial frequency] IN('day','week','semi_month','month','year')), 

[trial duration]    INT DEFAULT 10 NOT NULL 
CONSTRAINT ck_TrialDuration CHECK ([trial duration] > 0), 

[trial cycle]       INT DEFAULT 10 NOT NULL 
CONSTRAINT ck_TrialCycle CHECK ([trial cycle] > 0), 

[status]            TINYINT DEFAULT 4 NOT NULL, 

[sort order]        INT DEFAULT 11 NOT NULL, 

[date created]      DATETIME2 NOT NULL, 

[date modified]     DATETIME2 NOT NULL, 

[created by]        DATETIME NOT NULL, 

[modified by]       DATETIME NOT NULL, 

[active]            TINYINT DEFAULT 4 NOT NULL, 
);