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Questions - ifnull

UPDATE NULL of a column matching the ID in the same table

I'm working on housing data with several columns. In the cleaning process, I noticed that in the column 'PropertyAddress' are a few Null, and I want to confirm if those Null could be matched with the...
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Alex

mysql

join

insert-update

isnull

ifnull

Votes: 0

Answers: 1

Latest Answer

You can UPDATE using JOIN: https://www.mysqltutorial.org/mysql-update-join/ UPDATE nashville_housing a LEFT JOIN nashville_housing b ON a.ParcelID = b.ParcelID AND a.UniqueID <> b.UniqueID SET...
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Valeriu Ciuca

DragonSoul.cpp:516:18: warning: the compiler can assume that the address of &#39;aItemPoses&#39; will never be NULL [-Waddress]

I am getting a warning when compiling with gcc11 c++20. Can you help me solve it? ERROR: DragonSoul.cpp:516:18: warning: the compiler can assume that the address of 'aItemPoses' will never be NULL [-W...
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Nebi S.

c++

ifnull

Votes: 0

Answers: 0

Fetch last available value if there is NULL

I have a table that is essentially a purchases table that has purchase prices. When a purchase is made, it is recorded at an hour. Like in the table, ABC-123 was purchased on 2022-1-20 at 12:00. I wan...
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Maaz Shameem

postgresql

ifnull

Votes: 0

Answers: 1

Latest Answer

You can create a view with an aggregate function. Try this : CREATE VIEW test_view AS ( SELECT id_code , hour , (array_agg(purchase_price) FILTER (WHERE purchase_price IS NOT NULL) OVER ...
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Edouard

mysql - Query with IFNULL and CONCAT_WS returns empty string instead predefined IFNULL parameter in case of NULL

I am working on the complex MySQL query with subquery and JOINs and this is my query: SELECT id, ancient_source_name, ancient_source_name_alt, ancient_source_type, ancient_source_t...
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Boris J.

mysql

if-statement

subquery

ifnull

concat-ws

Votes: 0

Answers: 1

Latest Answer

CONCAT_WS() returns an empty string if all arguments after a non-null separator are NULL. See the demo. I did not find this stated explicitly in MySql's documentation (like it is made clear in SQL Ser...
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forpas

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