How do I update a single row in a SQL Server database? -

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How can I update a line?

I have a SQL Server database of 34 rows fe SYSTIMESTATE (14.10.2014 08: 01: 15: 000) and I will replace it with (04.11.2014 08 : 01: 15: 000)

How can I do this? Statement is SELECT with the statement UPDATE : 

  select from EXDOCS * where SYSTIMESTATE = '14.10.2014 08: 01: 15: 000 ''  
 
  set the update EXDOCS SYSTIMESTATE = '04 .11.2014 08: 01: 15: 000 'WHERE SYSTEMSTATE = '14 .10.2014 08: 01: 15: 000'  
 
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