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[英]Insert records into SQL Server database from user defined table type using stored procedure
[英]How to copy records from table and insert into same table using stored procedure SQL Server
使用group by
並having max(version) = 0
:
insert into student_name (student_id, student_name, version)
select student_id, max(student_name), 1
from student_name
group by student_id
having max(version) = 0
作為一個存儲過程,采用version
的參數,為沒有該版本記錄的學生插入記錄:並輸出插入的行:
create procedure dbo.insert_new_version (@version int) as
begin;
set nocount, xact_abort on;
insert into student_name (student_id, student_name, version)
output inserted.*
select
student_id
, student_name = max(student_name)
, version = @version
from student_name
group by student_id
having max(version) < @version
end;
reextester 演示: http ://rextester.com/JSTNI40605
返回:
+-----------+------------+--------------+---------+
| record_id | student_id | student_name | version |
+-----------+------------+--------------+---------+
| 11 | 3 | ccc | 1 |
+-----------+------------+--------------+---------+
您可以通過執行以下操作來選擇記錄:
select t.*
from t
where t.version = 0 and
not exists (select 1
from t t2
where t2.student_id = t.student_id and t2.version = 1
);
其余的只是一個insert
。
您可以像這樣選擇和插入
Insert INTO tableName select t1.student_Id, t1.student_name,1 from tablename t1
where t1.version = 0 and not exists
(select 1 from tablename t2 where t2.student_id = t.student_id and t2.version = 1);
您可以通過 LEFT Join 嘗試此操作:
INSERT INTO tbl
SELECT T1.record_id,T1.student_Id,T1.student_name, 1
FROM tbl T1 LEFT JOIN tbl T2
ON T1.student_Id = T2.student_Id AND T2.version = 1
WHERE T1.version = 0 AND T2.record_id IS NULL
我建議使用 while 循環遍歷表格並確定您需要復制的項目,然后將評估這些值,如果它們符合重新插入的標准,然后插入它們。
您的代碼應如下所示。 在適用的情況下添加 CREATE PROC 部分和編輯表名(注意:我已將其寫在記事本上,因此如果您遇到一些錯誤,請嘗試修復它們)
DECLARE @counter int = 0, @row_Count int = 0, @currentId int,
@currentName nvarchar(100), @version int, @current_Student_id int
SET @row_Count = (SELECT COUNT(record_Id) from yourTable)
WHILE @counter <= @row_Count
BEGIN
SET @currentId = (SELECT record_Id FROM (SELECT row_number() over (order by id)
AS RowNum, record_Id FROM yourTable) sub WHERE RowNum=@counter)
SET @currentName = (SELECT student_name FROM yourTable WHERE record_Id = @currentId)
SET @current_Student_id = (SELECT student_id FROM yourTable WHERE record_Id = @currentId)
SET @version = (SELECT version FROM yourTable WHERE record_Id = @currentId)
--USE IF to check if the current version is 0 and the student ID has not been inserted already
IF (SELECT COUNT(record_Id) FROM yourTable WHERE student_id = @current_Student_id AND version = 1) < 1
AND @version = 0
BEGIN
INSERT INTO yourTable (student_id, student_name, version)
VALUES
(
@current_Student_id,
@currentName,
1
)
END
SET @counter = @counter + 1;
END
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