Questions tagged [null]
A database concept used to represent missing, unknown or inapplicable data.
308
questions
1
vote
2answers
29 views
EAV - COUNT()/SUM() on column and row values with and without NULLs
Assume that there is a table
demo
with these data:
id
userID
title
data
1
1
DATE
01-01-2021
2
1
COLOR
RED
3
2
DATE
4
2
COLOR
YELLOW
5
3
DATE
04-01-2021
6
3
COLOR
RED
5
4
DATE
04-01-2021
6
4
...
1
vote
1answer
21 views
Displaying null fields as 0 in mySQL select [duplicate]
I have a database that collects statistics from Usenet. When I do a basic select such as:
select day, count(day) from statistics where month = 12 and year = 2020 group by day;
I get the result
+------+...
-1
votes
3answers
208 views
Function: if either x or y are null, return null
I'm looking for an Oracle 18c function that evaluates to null if either of two variables is null.
The Constraints: (details here)
The function/expression can't contain spaces (so CASE won't work).
I ...
1
vote
1answer
42 views
Find tables with columns with empty and NULL values in Postgresql
After some research I found an example where I can find tables and its columns with NULL values. But the function also returns true when the column is empty. It gives me errors when I try to add an or ...
2
votes
1answer
36 views
PostgreSQL's record type returning null?
I don't understand why this result is possible. Can someone explain why the first assert returns true and the second false? generate_token() is a function that generates a random bytea and inserts it ...
0
votes
0answers
31 views
Disallow empty strings in text columns (Aurora / PostgreSQL)
We have a Django application connected to an Oracle database running in production and we are planning to create a new instance on AWS. Both instances would coexist.
On AWS we would like to use Aurora ...
-1
votes
1answer
70 views
How to set default value as empty string for all rows at once in MySQL while creating the table
In MySQL, while creating a table, I'like to have empty string '' as value for all needed columns instead of 'NULL'.
Is it possible, is it safe and how can I do to do that at once?
I have the following ...
-1
votes
1answer
55 views
Get records where no column is null [duplicate]
I've a table with 100+ (nullable) columns and 10,000+ rows. I'd like to fetch rows that have no columns null.
id|f001|f002|f003|....f100
1 |null|aa | ss |sada
2 |sdad|aa | ss |sada
3 |as |aa | ss |...
-1
votes
1answer
28 views
Replacing Null value with existing value
How would it be possible to replace the null value from Order - column with the above existing value that has the the same Document-number?
Document Value Value2 Order
1234567 4 7 ...
-1
votes
1answer
16 views
Nullable integer as part of composite primary key
I want to store phone numbers as integers and I've created this SQL:
DROP TABLE `user_id_phone`;
CREATE TABLE `user_id_phone`
(
`user_id` int unsigned NOT NULL,
`country_code` ...
0
votes
1answer
70 views
What is the best way to store optional values in table?
I have a large table that will be partitioned (about 300 million rows). There are currently 57 columns in the table. At the moment we also have an 'Option' column, which is to hold values that would ...
-3
votes
1answer
42 views
Why am I getting errors which cannot logically happen? [duplicate]
I'm ready for the nuthouse at this point. This error makes me want to stab my eyes out after staring at the screen and testing stuff for literally MONTHS now!
The offending code, which looks to me ...
0
votes
1answer
199 views
Postgres 11 - Range Partitioning on a Date Column with NULL values
We have a table structure with parent and child records inside the same table. They are referenced via a column (parentId) which references the parent (and null on the top parent records). Also, we ...
0
votes
1answer
644 views
Testing a Hive array for IS NULL says not null
I have a table containing an array, and I want to check if it is empty or NULL. It appears that I cannot check the NULL directly! Can anyone shed light on why the NULL check isn't working?
create ...
1
vote
2answers
113 views
Why does my SELECT query not return null values? [duplicate]
I have the following SQL script:
CREATE temporary table if not EXISTS the_values (
key SERIAL,
value INTEGER NULL
);
insert into the_values(value) values (null),(1),(null),(2),(3),(4),(5),(6),(10),...
0
votes
0answers
46 views
MySql view returns a single NULL value for a NOT NULL column, why?
I am working with a database built by a vendor, which I have remote access to. I noticed that the field modify_date on one of the views is not null, according to DBeaver.
the tick indicates "not ...
-1
votes
1answer
45 views
Joining 3 tables together and selecting the null elements without using is not null [closed]
select Name from Passagerare
left join EB
on Passagerare.Personnr = EB.Personnr
left join MM
on Passagerare.Personnr = MM.Personnr
where Passagerare.Personnr = EB.Personnr or Passagerare.Personnr =...
5
votes
2answers
308 views
How can I set a column to NOT NULL without locking the table during a table scan?
(former question was: Will Postgres use a multi-column index when setting multiple colums not null?)
Typically, when I set a column not null, if it doesn't have an index then I add it first, so that ...
0
votes
2answers
22 views
How to check if staff member has end date with a Null value
I have a database that records employees tasks throughout the organisation and when they finish etc., I need to identify if each employee, has at least one row with a null value in either finish.
...
0
votes
3answers
52 views
Problem with IF statement [closed]
I am having an issue with this stored procedure. When the user selects "Yes", it should do what it says in the if statement for the "Yes" but it does not do anything, it does not insert anything into ...
0
votes
1answer
77 views
JOIN/Union Two tables, removing NULL where possible (similar to pandas concatenate)
I am wondering how to perform an operation that I guess is most akin to a concatenate if you're familiar with pandas.
Basically, what I want to do seems like a UNION where records are "collapsed" in ...
1
vote
2answers
49 views
Should fields that are set to Not Null also have a constraint refusing empty strings?
Any field that I would expect a value (Like an orderNumber or customerNumber) I would set as not nullable.
If I'm expecting the value of the field to be not null, shouldn't I also always have a ...
0
votes
0answers
13 views
What is the commonly-accepted practice to denote the different meaning of NULLs?
I am thinking about what's the meaning of NULL in my database systems. In some columns it mean unknown / missing data. In some columns it mean a not-applicable field. In some columns it mean the ...
1
vote
1answer
54 views
In SQL Server, for numeric data type, can the CHARACTER_MAXIMUM_LENGTH be different from NULL?
I have a SQL Server with numeric types for few columns.
When getting a table structure, I have the following results:
Query:
SELECT *
FROM DB.INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = '...
0
votes
1answer
217 views
How to remove NULL values in multidimensional array?
SELECT dt.name,dt.description,dt.odobj,dt.defval,dt.datatypeid
,array_agg(array[dtv.description::text,dtv.odobj::text,dtv.name::text,dtv.datatypevalueid::text,dtv.datatypeid::text]) as ...
4
votes
2answers
285 views
Why is the result of a totally deterministic and all-encompassing “case” in select query in view nullable?
I have a table, with Id as the primary key.
create table Anything
(
Id bigint not null primary key identity(1, 1)
)
When I look at this table in Object Explorer, I see this image of course:
As ...
0
votes
0answers
19 views
How to get latest record of partition when Field1 & Field2 is not null or get latest record where one is null and 2nd latest where same field isn't?
Hard question to verbalize in the title with character constraint, sorry.
I have Table1 with the fields PartitionField, ImportantField1, ImportantField2, DateField.
ImportantField1 or ImportantField2 ...
1
vote
0answers
37 views
Why does PostgreSQL explicitly cast NULL to parameter data type in functions?
Let's say I create the following function:
create or replace function my_new_function(
p_something text default null
)
etc....
But if I go to check the function on PostgreSQL I see this instead:
...
2
votes
1answer
33 views
How to filter table 2 before joining to table 1 so that the result still includes all of table 1, even if no match in table 2?
The following returns all rows from table 1 where post_type = dlm_download. It groups like values from table 2 by the matching column in table 1 so that each row in table 1 has a maximum of one ...
1
vote
1answer
115 views
Database Design: Normalization and NULL values
I have normalized my table from 0NF to 2NF (hopefully correct).
How do I now go from 2NF to 3NF?
Also, ResponseToTransactionId is a recursive foreign key that will contain NULL values a lot of the ...
0
votes
2answers
19 views
Is there any way to force at least one column NOT NULL
I have a schedule_days table that is having id, day, date columns.
id - auto increment, primary key
day - weekday - enum(weekdays) default not null
date - a specific date - default not null
...
-2
votes
1answer
159 views
Working with NULL Date Fields [closed]
I have a derived VARCHAR date field that I need to use for deriving another field, based off of whether or not the date field has a value. The derived date field is called "AmortDate" and I'm ...
1
vote
3answers
79 views
NULL as a @variable within WHERE clasue
I would like to SET 'IS NULL' as a variable and use it in a WHERE clause.
I will be unioning many tables together that carry the same WHERE clause and would like flexibility to use a variable for my ...
-1
votes
1answer
64 views
Column values in SQL Server changes to null [closed]
There is one specific column whose value automatically changes to null after data is inserted into it.
I have tried to update the column from designer, update the column with query, delete the ...
1
vote
1answer
36 views
Null check condition in Where clause
DECLARE @SubDesc1 nvarchar(100)
SET @SubDesc1 = null
I would like to do something like that.
Query 1
SELECT *
From Table1
where Category = 'Category1'
AND [Description] ='ABC'
AND ...
0
votes
2answers
23 views
Work around average behaviour with nulls
I have two tables:
Product (PK product_id, brand, model)
Order (PK invoice_id, customer_name, customer_email, FK product_id)
I am trying to find the product(s) whose number of times that product is ...
6
votes
1answer
224 views
Why does ORDER BY NULLS LAST affect the query plan on a primary key?
Using PostgreSQL 11, I have the following table with around 450 million rows:
postgres=> \d+ sales
Table "public.sales"
...
-1
votes
1answer
60 views
Can't get this query to work properly
I've been trying to get the following query working for days but I can't seem to solve my issue. I'm using the MySQL version 5.7.9
I have the following database:
CREATE TABLE user (
id INT NOT ...
1
vote
2answers
267 views
How to filter hstore where values are not null in a trigger?
The easiest way to explain the question is in the usage of an audit trigger.
However, on insert it saves all values, including null values. I want to filter out the null values in the hstore(NEW.*). ...
2
votes
2answers
45 views
NULL rows and IS NULL
I've been writing some queries that look like this:
SELECT
...
FROM table_a a
LEFT JOIN table_b b
ON b.id = a.id
LEFT JOIN table_c c
ON c.id = a.id
In these queries only one of the joins can ...
-1
votes
1answer
27 views
null value in postgres functions
I am new in postgres and i found this issue with this simple function
CREATE OR REPLACE FUNCTION "public"."TEST"("disponibile" int2=0, "extra" int2=0, "ordini" int2=0, "prenotata" int2=0)
RETURNS "...
2
votes
1answer
71 views
Oracle DISTINCT with NULLable columns
There is a longstanding(?) problem(?) with Oracle that if you want to use a DISTINCT select on a column which has a B*-Tree Index but is nullable, that the index is not used. (As other answers suggest,...
1
vote
3answers
522 views
Take average of multiple nullable columns
I have an example table (year) as below in PostgreSQL 9.5:
Name | 2010 | 2011 | 2012
-------------------------
A | 10 | | 40
B | 10 | 20 | 30
Now, if I write a simple query as ...
6
votes
2answers
703 views
NULL value causes blank row in SELECT results for text concatenation
I have a query for producing some text for creating some VALUES text to put in a .sql file for inserting some rows. I get a blank line in the results:
postgres=# SELECT ' (' || obj_id || ', ''' || ...
3
votes
2answers
210 views
How to understand “NULL NOT IN” when the set is empty?
The SQL in this question is for Oracle. But you can simply remove FROM dual to make it work on SQL Server (which returns the same result as Oracle).
I have the following SQL:
SELECT 1
FROM dual
...
7
votes
1answer
465 views
Multiple BIT datatype columns in the same table
Consider the following information coming from Microsoft SQL docs pages:
The SQL Server Database Engine optimizes storage of bit columns. If
there are 8 or fewer bit columns in a table, the ...
1
vote
1answer
44 views
Why null is getting compared with null in the join condition in SQL Server 2016?
It's a simple self join I am trying to do on below data
and the O/P I am getting after running following query (This is not the complete output, just showing the null part of it)
select a.col1, a....
12
votes
3answers
967 views
Increase speed altering column on large table to NON NULL
I recently added a NULL-able bit column to a table which has close to 500 million rows. There's not a default on the column, however all inserts are specifying a value of 0 or 1, and I ran a one-time ...
1
vote
2answers
2k views
MySQL 8.0 cannot insert NULL values to date field
I'm trying to insert a data from file to MYSQL 8.0 using the InnoDB engine.
I'm using this query:
LOAD DATA INFILE '/var/lib/mysql-files/item_new_1_4.dat'
INTO TABLE Item FIELDS TERMINATED BY '|';
...
0
votes
1answer
57 views
Comparing nullable column values using “IS NULL” versus “= NULL”
I'm dealing with nullable values in a column of a table, i'm wondering why this:
with cte as (
select 'c1'::text as c1,null::text as c2
union
select 'c2'::text as c1,null::text as c2
)
...
