SQL 随机名称生成器未在同一行中插入名字和姓氏

Question

我设法创建了一个简单的查询，它随机选择名字和姓氏并将它们插入结果 table。我想创建一些可以与我运行必须制造大量数据的各种测试互换的东西。这是代码（为了简单起见，我只包含了 5 个名字和姓氏）：

SELECT 
    FirstName, LastName
FROM
    (SELECT TOP 1 
         FirstName 
     FROM 
         (SELECT 'John' AS FirstName 
          UNION SELECT 'Tim' AS FirstName 
          UNION SELECT 'Laura' AS FirstName
          UNION SELECT 'Jeff' AS FirstName
          UNION SELECT 'Sara' AS FirstName) AS First_Names 
     ORDER BY NEWID()) n1
FULL OUTER JOIN 
    (SELECT TOP 1
         LastName 
     FROM (SELECT 'Johnson' AS LastName 
           UNION SELECT 'Hudson' AS LastName 
           UNION SELECT 'Jackson' AS LastName
           UNION SELECT 'Ranallo' AS LastName
           UNION SELECT 'Curry' AS LastName) AS Last_Names 
     ORDER BY NEWID()) n2 ON [n1].FirstName = [n2].LastName
WHERE 
    n1.FirstName IS NOT NULL OR n2.LastName IS NOT NULL

结果如下：

FirstName LastName 
NULL      Hudson
John      NULL

我希望结果 return 一行的名字和姓氏是随机生成的，这样每一行都有一个完整的名字（没有 NULL 值）。我确定我忽略了一些简单的事情。

Answer 1

问题出在您的加入上。您可以这样做：

SELECT FirstName, LastName
FROM
(SELECT TOP 1 FirstName 
FROM (SELECT 'John' AS FirstName 
UNION SELECT 'Tim' AS FirstName 
UNION SELECT 'Laura' AS FirstName
UNION SELECT 'Jeff' AS FirstName
UNION SELECT 'Sara' AS FirstName) AS First_Names ORDER BY NEWID())n1
CROSS JOIN 
(SELECT TOP 1 LastName 
FROM (SELECT 'Johnson' AS LastName 
UNION SELECT 'Hudson' AS LastName 
UNION SELECT 'Jackson' AS LastName
UNION SELECT 'Ranallo' AS LastName
UNION SELECT 'Curry' AS LastName) AS Last_Names ORDER BY NEWID())n2

Answer 2

以下代码将允许您生成一系列随机名称，其中交叉联接解决方案一次只允许一个名称。不确定您是否需要多次执行此操作，但如果您这样做：

create table #table (firstname varchar(50), lastname varchar(50))

declare @counter int = 1 
declare @max int = 5 --set number of repetitions here
declare @a varchar(50)
declare @b varchar(50)

while @counter <= @max
begin

SET @a = (SELECT TOP 1 FirstName 
    FROM (SELECT 'John' AS FirstName 
    UNION SELECT 'Tim' AS FirstName 
    UNION SELECT 'Laura' AS FirstName
    UNION SELECT 'Jeff' AS FirstName
    UNION SELECT 'Sara' AS FirstName) AS First_Names ORDER BY NEWID())

SET @b =
    (SELECT TOP 1 LastName 
    FROM (SELECT 'Johnson' AS LastName 
    UNION SELECT 'Hudson' AS LastName 
    UNION SELECT 'Jackson' AS LastName
    UNION SELECT 'Ranallo' AS LastName
    UNION SELECT 'Curry' AS LastName) AS Last_Names ORDER BY NEWID())

    insert into #table values (@a, @b)

    set @counter = @counter + 1
end

select * from #table

Answer 3

如果您需要获得超过 1 个组合，这里是对此类事情使用循环的替代方法。

declare @max int = 5;

with FirstNames(FName) as
(
    SELECT 'John' UNION ALL
    SELECT 'Tim' UNION ALL
    SELECT 'Laura' UNION ALL
    SELECT 'Jeff' UNION ALL
    SELECT 'Sara'
)
, LastNames(LName) as
(
    SELECT 'Johnson' UNION ALL
    SELECT 'Hudson' UNION ALL
    SELECT 'Jackson' UNION ALL
    SELECT 'Ranallo' UNION ALL
    SELECT 'Curry'
)
, SortedNames(FName, LName, RowNum) as
(
    select FName
        , LName
        , ROW_NUMBER() over (Order by newid())
    from FirstNames
    cross join LastNames
)

select FName
    , LName
from SortedNames
where RowNum <= @max
order by NEWID();

Answer 4

如果您想高效地生成多行（您确实提到需要生成大量示例数据），那么这是我今天早些时候在 S.O 上的另一个问题上发布的内容。（）。该问题涉及随机化 4 个字段而不是两个字段，但我将这些额外的字段保留在这里，以便您了解适应您可能拥有的其他场景是多么容易。删除任何字段都相当简单，并且也很容易向 4 table 变量中的任何一个添加新值（以增加可能组合的数量），因为查询会动态调整随机化范围以适应每个 table 变量（即第 1 - n 行）中的任何数据。

DECLARE @TelNumber TABLE (TelNumberID INT NOT NULL IDENTITY(1, 1),
                          Num VARCHAR(30) NOT NULL);
INSERT INTO @TelNumber (Num) VALUES ('1525407'), ('5423986'), ('1245398'), ('32657891'),
                                    ('123658974'), ('7896534'), ('12354698');

DECLARE @FirstName TABLE (FirstNameID INT NOT NULL IDENTITY(1, 1),
                          Name NVARCHAR(30) NOT NULL);
INSERT INTO @FirstName (Name) VALUES ('Babak'), ('Carolin'), ('Martin'), ('Marie'),
                  ('Susane'), ('Michail'), ('Ramona'), ('Ulf'), ('Dirk'), ('Sebastian');

DECLARE @LastName TABLE (LastNameID INT NOT NULL IDENTITY(1, 1),
                         Name NVARCHAR(30) NOT NULL);
INSERT INTO @LastName (Name) VALUES ('Bastan'), ('Krause'), ('Rosner'),
                  ('Gartenmeister'), ('Rentsch'), ('Benn'), ('Kycik'), ('Leuoth'),
                  ('Kamkar'), ('Kolaee');

DECLARE @Address TABLE (AddressID INT NOT NULL IDENTITY(1, 1),
                        Addr NVARCHAR(100) NOT NULL);
INSERT INTO @Address (Addr) VALUES ('Deutschlan Chemnitz Sonnenstraße 59'), (''),
  ('Deutschland Chemnitz Arthur-Strobel straße 124'),
  ('Deutschland Chemnitz Brückenstraße 3'),
  ('Iran Shiraz Chamran Blvd, Niayesh straße Nr.155'), (''),
  ('Deutschland Berlin Charlotenburg Pudbulesky Alleee 52'),
  ('United State of America Washington DC. Farbod Alle'), ('');

DECLARE @RowsToInsert INT = 10000;

;WITH rowcounts AS
(
  SELECT (SELECT COUNT(*) FROM @TelNumber) AS [TelNumberRows],
         (SELECT COUNT(*) FROM @FirstName) AS [FirstNameRows],
         (SELECT COUNT(*) FROM @LastName) AS [LastNameRows],
         (SELECT COUNT(*) FROM @Address) AS [AddressRows]
), nums AS
(
  SELECT TOP (@RowsToInsert)
         (CRYPT_GEN_RANDOM(1) % rc.TelNumberRows) + 1 AS [RandomTelNumberID],
         (CRYPT_GEN_RANDOM(1) % rc.FirstNameRows) + 1 AS [RandomFirstNameID],
         (CRYPT_GEN_RANDOM(1) % rc.LastNameRows) + 1 AS [RandomLastNameID],
         (CRYPT_GEN_RANDOM(1) % rc.AddressRows) + 1 AS [RandomAddressID]
  FROM   rowcounts rc
  CROSS JOIN msdb.sys.all_columns sac1
  CROSS JOIN msdb.sys.all_columns sac2
)
-- INSERT dbo.Unsprstb(Firstname, Lastname, Tel, Address)
SELECT fn.Name, ln.Name, tn.Num, ad.Addr
FROM   @FirstName fn
FULL JOIN nums
        ON nums.RandomFirstNameID = fn.FirstNameID
FULL JOIN @LastName ln
        ON ln.LastNameID = nums.RandomLastNameID
FULL JOIN @TelNumber tn
        ON tn.TelNumberID = nums.RandomTelNumberID
FULL JOIN @Address ad
        ON ad.AddressID = nums.RandomAddressID;

备注：

需要 FULL JOIN 而不是 INNER JOIN 才能获得整个 @RowsToInsert 行数。
由于这种随机化的本质，并且没有使用 DISTINCT 过滤掉它们，因此可能存在重复行。但是，DISTINCT 不能与问题中给定的样本数据一起使用，因为每个数组/table 变量中的元素数量仅提供 6300 个唯一组合，并且要求生成的行数为 10,000。如果将更多值添加到 table 变量，使得可能的唯一组合总数超过请求的行数，则可以将 DISTINCT 关键字添加到 nums CTE，或者查询可以重组为简单地 CROSS JOIN 所有 table 变量，包括一个 ROW_COUNT() 字段，并使用 ORDER BY NEWID() 获取 TOP(n)（但该方法有它的优缺点也是如此）。
INSERT 已被注释掉，因此更容易看出上面的查询产生了所需的结果。只需取消注释 INSERT 即可让查询执行实际的 DML 操作。

SQL 随机名称生成器未在同一行中插入名字和姓氏

SQL random name generator not inserting first and last name in the same row

sql

sql-server

tsql

join

outer-join