How to update table values with join in SQL server

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Hi, I Have the below tables that i want to update the Agent table with column AgentExpirationDate with field from the other 2 tables
based on state matching the expiration date and get max expirationdate from Authority table if Authority table value is null then Account Expiration date should update instead of null.

Below are the tables

tbAccount
AccountID, AccountState, AccountExpirationdate 
AC1	       PC		   ‘2030/1212’
AC1	       MC		    ‘2022/1212’
AC2         PQ   		‘2024/1212’    
AC3	       LQ		    ‘2026/1212’
AC4         KC		    ‘2027/1212’
AC5	       PC		    ‘2028/1212’
AC6	       LC		    ‘2029/1212’
AC6         AC		    ‘2024/1212’

tblAgent
AgentID,  AgentExpirationDate 
Ag1          ‘2025-12-12’
Ag4	         ‘2027/1212’
Ag5          ‘2029-12-12’
Ag6          ‘2025-12-12’

tblAuthorities
AuthorityId,  EnityID, State, AuthorityExpirationDate ,AgentID
Au1           Ac1      PC	 ‘2023-12-12’              Ag1
Au2	          Ac1	   DC	‘2024-12-12’               Ag1 
Au3	          Ac1	   MC	‘2025-12-12’               Ag1
Au4	          Ac4      KC	NULL                       Ag4 
Au5	          Ac5	   PC	‘2023-12-12’               Ag5
Au6	          Ac5	   MV	‘2029-12-12’               Ag5      
Au7	          Ac6	   LC	‘2023-12-12’	           Ag6
Au8	          Ac6	   AC	‘2025-12-12’               Ag6

What I have tried:

Could you please assist on the join table using the above table that i am getting proper query and update values to my agent table

Posted 10-Aug-23 9:31am

Member 15090354

Updated 10-Aug-23 9:35am

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Comments

Richard MacCutchan 11-Aug-23 3:41am

If that really is the format of the dates in your database then you are in for a host of problems.

Member 15090354 11-Aug-23 4:00am

The dates are sample data but in database utc format only

CHill60 11-Aug-23 6:57am

Can you show a worked example of your expected results and share the code you have tried so far

[no name] 13-Aug-23 11:37am

Sounds more like a case for an "agent status query" ... And not an "update".

CHill60 5-Sep-23 4:47am

If you are still having problems with this then please give a worked example of your expected results and share the code you have tried so far

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