Do you mean perhaps to define the table as follows:
```
CREATE TABLE t1
(
a INTEGER NOT NULL ON CONFLICT REPLACE DEFAULT 1,
b INTEGER NOT NULL ON CONFLICT REPLACE DEFAULT 2,
c INTEGER NOT NULL ON CONFLICT REPLACE DEFAULT 3
);
```
so that if you try to insert a NULL value you get a default instead?
```
sqlite> CREATE TABLE t1
...> (
...> a INTEGER NOT NULL ON CONFLICT REPLACE DEFAULT 1,
...> b INTEGER NOT NULL ON CONFLICT REPLACE DEFAULT 2,
...> c INTEGER NOT NULL ON CONFLICT REPLACE DEFAULT 3
...> );
sqlite> insert into t1 values (58,null,null);
sqlite> insert into t1 values (null,36,null);
sqlite> insert into t1 values (null,38,1748);
sqlite> select * from t1;
┌────┬────┬──────┐
│ a │ b │ c │
├────┼────┼──────┤
│ 58 │ 2 │ 3 │
│ 1 │ 36 │ 3 │
│ 1 │ 38 │ 1748 │
└────┴────┴──────┘
sqlite>
```