Question

我有一个SQL命令，可以从秒转换为HH：MM：SS。它创建新表，因为它从原始表中获取秒数。有没有办法在创建新表时设置name列的主键？这是我正在使用的SQL：

mso-header: url(\"mydocument_files/headerfooter.htm\") h1;
mso-footer: url(\"mydocument_files/headerfooter.htm\") f1;

我知道我可以创建另一个alter table命令，为我设置它：

SELECT 
    main.[Name], 
    RIGHT('0' + CAST(main.[Staffed Time] / 3600 AS VARCHAR), 2) + ':' +
       RIGHT('0' + CAST((main.[Staffed Time] / 60) % 60 AS VARCHAR), 2)  + ':' +
       RIGHT('0' + CAST(main.[Staffed Time] % 60 AS VARCHAR), 2) AS StaffedTime, 
    RIGHT('0' + CAST(main.[Time in Break] / 3600 AS VARCHAR), 2) + ':' +
       RIGHT('0' + CAST((main.[Time in Break] / 60) % 60 AS VARCHAR), 2)  + ':' +
       RIGHT('0' + CAST(main.[Time in Break] % 60 AS VARCHAR), 2) AS BreakTime, 
    RIGHT('0' + CAST(main.[Time in Lunch] / 3600 AS VARCHAR), 2) + ':' +
       RIGHT('0' + CAST((main.[Time in Lunch] / 60) % 60 AS VARCHAR), 2)  + ':' +
       RIGHT('0' + CAST(main.[Time in Lunch] % 60 AS VARCHAR), 2) AS LunchTime
INTO
    DailyReport
FROM   
    main

我希望有一种方法可以让它在创建后立即设置PK，这可能吗？

Answer 1

在插入数据之前，尝试使用PRIMARY KEY设置创建新的表变量。请尝试下面的代码

CREATE TABLE DailyReport (
                     ID INT Primary Key IDENTITY(1,1),
                     [Name] NVARCHAR(30) ,
                     StaffedTime NVARCHAR(30), 
                     BreakTime NVARCHAR(30),
                     LunchTime NVARCHAR(30)
                    )

INSERT INTO DailyReport
SELECT main.[Name], 
 RIGHT('0' + CAST(main.[Staffed Time] / 3600 AS VARCHAR),2) + ':' +
 RIGHT('0' + CAST((main.[Staffed Time] / 60) % 60 AS VARCHAR),2)  + ':' +
 RIGHT('0' + CAST(main.[Staffed Time] % 60 AS VARCHAR),2)
 AS StaffedTime, 
 RIGHT('0' + CAST(main.[Time in Break] / 3600 AS VARCHAR),2) + ':' +
 RIGHT('0' + CAST((main.[Time in Break] / 60) % 60 AS VARCHAR),2)  + ':' +
 RIGHT('0' + CAST(main.[Time in Break] % 60 AS VARCHAR),2) 
 AS BreakTime, 
 RIGHT('0' + CAST(main.[Time in Lunch] / 3600 AS VARCHAR),2) + ':' +
 RIGHT('0' + CAST((main.[Time in Lunch] / 60) % 60 AS VARCHAR),2)  + ':' +
 RIGHT('0' + CAST(main.[Time in Lunch] % 60 AS VARCHAR),2) 
 AS LunchTime
FROM main

SELECT * FROM DailyReport

Answer 2

试试这个......

ALTER TABLE DailyReport
   ADD CONSTRAINT PK_Name PRIMARY KEY (Name);

Answer 3

无法自动创建primary key constraint。你要么：

显式创建定义了PRIMARY KEY的表，并有一个n INSERT ... INTO

OR

使用SELECT INTO表并通过添加PK约束（ALTER TABLE ... ADD CONSTRAINT PK_tablename PRIMARY KEY (col_name)）

提示：尝试始终使用命名约束，因为如果名称已修复（不是服务器生成），则更容易更改（删除）

INSERT INTO新表设置主键

3 个答案: