How to change sa password in SQL Server Express?
If you want to change your 'sa' password with SQL Server Management Studio, here are the steps:
1 Login using Windows Authentication and ".SQLExpress" as Server Name
2 Change server authentication mode - Right click on root, choose Properties, from Security tab select "SQL Server and Windows Authentication mode", click OK
3 Set sa password - Navigate to Security > Logins > sa, right click on it, choose Properties, from General tab set the Password (don't close the window)
4Grant permission - Go to Status tab, make sure the Grant and Enabled radiobuttons are chosen, click OK
5 Restart SQLEXPRESS service from your local services (Window+R > services.msc)
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