Question

我有一个学生平均四个大学年级和领域的表格，用于找到四年制学位的平均值，最后一个领域是用于评分系统。

我的问题：我想根据final_avg列制作成绩字段值。我怎样才能做到这一点？

例如，如果final_avg < 50然后grade = failed，final_avg >= 50 and final_avg < 60然后是grade = satisfactory，依此类推。

这是我的表：

CREATE TABLE averages_tbl(
    [avg_id] [int] IDENTITY(1,1) NOT NULL,
    [Student_ID] [int] NOT NULL,
    [f_s_avg] [float] NULL,
    [s_s_avg] [float] NULL,
    [t_s_avg] [float] NULL,
    [fu_s_avg] [float] NULL,
    [final_avg]  AS ((([f_s_avg]+[s_s_avg])+[t_s_avg])+[fu_s_avg]),
    [grade] [nvarchar](20) NULL,
)

Answer 1

简单方法：

CREATE TABLE averages_tbl(
    [avg_id] [int] IDENTITY(1,1) NOT NULL,
    [Student_ID] [int] NOT NULL,
    [f_s_avg] [float] NULL,
    [s_s_avg] [float] NULL,
    [t_s_avg] [float] NULL,
    [fu_s_avg] [float] NULL,
    [final_avg]  AS ((([f_s_avg]+[s_s_avg])+[t_s_avg])+[fu_s_avg]),
    [grade] AS (CASE WHEN ((([f_s_avg]+[s_s_avg])+[t_s_avg])+[fu_s_avg]) < 50 THEN 'Failed' 
                     WHEN ((([f_s_avg]+[s_s_avg])+[t_s_avg])+[fu_s_avg]) between 50 and 59 THEN 'Satisfied'
                     ELSE 'Whatever' END)
)

或ALTER TABLE：

ALTER TABLE averages_tbl DROP COLUMN [grade]

ALTER TABLE averages_tbl ADD [grade] AS (
    CASE WHEN ((([f_s_avg]+[s_s_avg])+[t_s_avg])+[fu_s_avg]) < 50 THEN 'Failed' 
         WHEN ((([f_s_avg]+[s_s_avg])+[t_s_avg])+[fu_s_avg]) between 50 and 59 THEN 'Satisfied'
         ELSE 'Passed' END)

如何在sql server表创建中进行评分系统

1 个答案: