sql server - SQL insert into fails using substring from same table -



sql server - SQL insert into fails using substring from same table -

i create process using substring table1.column2 , insert results table1.column6. trying query below insert fails. tries insert column (column1) id column. specify column6 not work.

insert table1(column6) select substring(column1,1,3) table1

error:

msg 515, level 16, state 2, line 1 cannot insert value null column 'column1id', table 'dbo.table1'; column not allow nulls. insert fails.

if table contain info , column6 empty (null), must utilize update command

update table1 set column6 = substring(column1,1,3)

that utilize info stored table1 , update column6

sql sql-server

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