SELECT t.column_name
FROM user_tab_columns t
WHERE t.nullable = 'Y' AND t.table_name = 'mytable' AND t.num_distinct = 0
Also,before running it update your statistics:
BEGIN
DBMS_STATS.gather_database_stats();
END
Frage
I have a table with 260 columns, I just want to see only columns with nulls in it. I know there are a few longer versions to see that information but is there an quicker way ? Thanks Gurus
Lösung
SELECT t.column_name
FROM user_tab_columns t
WHERE t.nullable = 'Y' AND t.table_name = 'mytable' AND t.num_distinct = 0
Also,before running it update your statistics:
BEGIN
DBMS_STATS.gather_database_stats();
END
Andere Tipps
If your question is about displaying Nullable
table columns, look @Mihai...
You can definitely write dynamic Pl/Sql to build and execute a statement containing only columns that contain null. You can use series of loops, Ref_cursor, Execute Immediate, oracle data dictionaries, etc.
But if you would be able to, you would know already.
Regularly, you can select some data where certain values are null
. E.g.
Select * From myTable where Col1 is null or col2 is null... -- 258 more columns
This will return all 260 columns, N
rows where at least one column is Null