我试图创建一个表来保存贸易展览,我需要将Year和Month保存到不同的列中。
我的后端和前端开发人员在检查数据时遇到问题。我需要检查年份是4的数字和1-12之间的月份。 速度对我很重要。
CREATE TABLE [dbo].[TradeShows](
[TradeShowsID] [bigint] IDENTITY(1,1) NOT NULL,
[TradeShowsName] [nvarchar](100) NULL,
[YearAttended] [smallint] NULL,
[MonthAttended] [tinyint] NULL,
CONSTRAINT [PK_TradeShows] PRIMARY KEY CLUSTERED
(
[TradeShowsID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO
答案 0 :(得分:1)
只需使用check
约束:
alter table TradeShows add constraint chk_tradeshows_year
check (YearAttended >= 2000 and YearAttended < 2100);
alter table TradeShows add constraint chk_tradeshows_month
check (MonthAttended >= 1 and MonthAttended <= 12);
或者,您可能会幻想并验证两者共同构成一个有效日期:
alter table TradeShows add constraint chk_tradeshows_year_month
check (try_convert(date, concat('-', YearAttended, MonthAttended, '-01')) is not null);