Question : look up table value with sql

I have two tables,
table1, has 2 fields key1 and value1
key1 is a set up look up keys which I want to match, value1 is an and empty field where I want the matched values.

table2 is my look up table,
containing 2 fields key2 and value2

with sql, how do I populate the value1 field with looked up values from the look up table.

Answer : look up table value with sql

try

select t1.*, t2.value2
from table1 t1, table2 t2
where t1.key1=t2.key2