How to update only one row in a table?

Question

How to I can update only one record in a table?

Table:

name       name1       name2
----------------------------
xx         xy          xz
xx         xx          xx
xx         xx          xx
xx         xx          xx
xy         xx          zz

Update query:

UPDATE table1 
SET name2 = '01' 
WHERE name1='xx'

I need update only one row per time.

Answer 1

you can use ROWCOUNT

SET ROWCOUNT 1

UPDATE table1 
SET name2 = '01' 
WHERE name1='xx'

SET ROWCOUNT 0

or you can use update top

UPDATE TOP (1) table1 
SET name2 = '01' 
WHERE name1='xx'