Hello Ilya, Thanks for the reply. I've tried "Merge into", it does not satisfy my needs.
For example,
I create a table with
create table a(a varchar, b varchar,c varchar, primary key(a));
And I inserted one record into table a with
merge into a(a,b) values('1','1');
Then I want to update this record by adding value to column c.
But when I try this sql
merge into a(a,c) values('1','1');
The value of column b is deleted.
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