[sqlite] new column

[守株待兔]

there are tow column x1,x2 in table t ,all real
alter table  t  add  column  c1 real;
select  x1+x2 as  c1 from t;
there ara output in my screen,but in the database,
c1  column has no value,how can i make the value of c1 column =x1+x2?
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