SSMS 存储过程 - 更新表

Question

I'm running into some difficulty trying to take data in one table, aggregate it, and then paste it into another table. I'm not getting any errors, but when I click execute, nothing updates in the new table. I'm using a version of SSMS that was downloaded last year (version 14).

Table OPEANSEAT_Hist =

• table with OS_ID with multiple rows for [UPDATED_TIMESTAMP] that serves as versions (so one OS_ID could have 10 timestamps on a different row)
• Closed date is the initial [UPDATED_TIMESTAMP] the OS_ID was closed (there could be multiple [UPDATED_TIMESTAMP] after it was closed, I want the earliest one.

My new table: OPENSEAT_CloseDates

• OS_ID - numeric
• CLOSE_DATE - datetime

This table should only have 1 row per OS_ID with the CLOSE_DATE (or null if the OS_ID has not yet been closed)

This is what I have so far:

ALTER PROCEDURE [PS_UPDATE_OPENSEAT_closedates]
AS
DELETE FROM [OPENSEAT_CloseDates]
UPDATE OPENSEAT_CloseDates

SET
    OPENSEAT_CloseDates.OS_ID = ( 
            SELECT t.OS_ID
            FROM [dbo].[OPENSEAT_Hist] t
            where t.OS_ID = OPENSEAT_Hist.OS_ID
            GROUP BY [OS_ID]),

    OPENSEAT_CloseDates.[CLOSE_DATE] = ( 
            SELECT MIN(CAST([UPDATED_TIMESTAMP] AS DATETIME))
            FROM [dbo].[OPENSEAT_Hist] s
            WHERE CLOSED_REASON IS NOT NULL AND s.OS_ID = OPENSEAT_Hist.[OS_ID]
            GROUP BY [OS_ID])

from OPENSEAT_Hist

Answer 1

I realized I need to do INSERT instead of an update.

ALTER PROCEDURE [dbo].[PS_UPDATE_OPENSEAT_closedates]

AS
DELETE FROM [dbo].[OPENSEAT_CloseDates]
BEGIN
    INSERT INTO OPENSEAT_CloseDates
        SELECT 
            (SELECT MIN(CAST([UPDATED_TIMESTAMP] AS DATETIME))
            FROM [dbo].[OPENSEAT_Hist]
            WHERE OPENSEAT_Hist.OS_ID = t.[OS_ID]
            GROUP BY [OS_ID]) as CLOSE_DATE, 
            t.OS_ID

            FROM [dbo].[OPENSEAT_Hist] t
            where t.CLOSED_REASON is not null
            GROUP BY OS_ID

end