Updating SQL Tables Based on Matching IDs
This guide demonstrates how to update records in one SQL table (Sales_Import
) using corresponding data from another table (RetrieveAccountNumber
), matching on a common LeadID
. A common challenge is updating AccountNumber
in Sales_Import
using values from RetrieveAccountNumber
without encountering null values. The solution utilizes an UPDATE
statement with a JOIN
.
Efficiently Updating Records with JOINs
The UPDATE ... FROM ... JOIN
syntax allows for efficient updates by combining data from multiple tables. This method ensures only matching records are updated.
MS SQL Server:
UPDATE Sales_Import SET AccountNumber = RAN.AccountNumber FROM Sales_Import SI INNER JOIN RetrieveAccountNumber RAN ON SI.LeadID = RAN.LeadID;
MySQL and MariaDB:
UPDATE Sales_Import SI, RetrieveAccountNumber RAN SET SI.AccountNumber = RAN.AccountNumber WHERE SI.LeadID = RAN.LeadID;
Explanation:
-
UPDATE Sales_Import
: This specifies the target table for the update operation. -
SET AccountNumber = RAN.AccountNumber
: This assigns theAccountNumber
from theRetrieveAccountNumber
table (RAN.AccountNumber
) to theAccountNumber
column in theSales_Import
table. -
FROM Sales_Import SI INNER JOIN RetrieveAccountNumber RAN ON SI.LeadID = RAN.LeadID
(MS SQL) orUPDATE Sales_Import SI, RetrieveAccountNumber RAN WHERE SI.LeadID = RAN.LeadID
(MySQL/MariaDB): This joins the two tables based on theLeadID
, ensuring that only rows with matching IDs are updated. TheINNER JOIN
(MS SQL) orWHERE
clause (MySQL/MariaDB) acts as the matching criteria.
This approach directly addresses the issue of null values by only updating rows where a matching LeadID
exists in both tables. This results in a cleaner and more efficient update process.
The above is the detailed content of How to Update One SQL Table from Another Using a Matching ID?. For more information, please follow other related articles on the PHP Chinese website!

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