ORA-01400: cannot insert NULL into (string)

Cause: An attempt was made to insert a NULL into the column “USER”.”TABLE”.”COLUMN”.
 For example, if you enter:
 connect scott/tiger create table a (a1 number not null); insert into a values (null);
 Oracle returns:

ORA-01400 cannot insert NULL into (“SCOTT”.”A”.”A1″) : which means you cannot insert NULL into “SCOTT”.”A”.”A1″.

Action: Retry the operation with a value other than NULL.

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