SQL using If Not Null on a Concatenation - Stack Overflow
If I have the table … This will display Firstname-Middlename-Surname e.g. … The second one (Jane’s) displays correct, however since John doesn’t have a middlename, I want it to ignore the second dash.
sql - Union to handle NULL values - Stack Overflow
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
sql - CONCAT'ing NULL fields - Stack Overflow
I have a table with three fields, FirstName, LastName and Email. Here's some dummy data: … Now, if I do: … Vitals for Joe is null, as there is a single null field. How do you overcome this behaviour?
mysql concate check not null - Stack Overflow
I dont want to return null value, how to check not null or how to make isset cond in query …
sql - WHERE all IS NOT NULL - Stack Overflow
How can I run a MySQL query that selects everything that is not null? It would be something like … Do I just remove the all and go..?
SQL NULL Values - IS NULL and IS NOT NULL
Note: A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value
SQL is null and = null - Stack Overflow
What is the difference between … and … and why does the latter not work?
MySQL 8.0 Reference Manual :: B.6.4.3 Problems with NULL Values
An expression that contains NULL always produces a NULL value unless otherwise indicated in the documentation for the operators and functions involved in the expression. All columns in the following example return NULL: Press CTRL+C to copy. mysql> SELECT NULL, 1+NULL, CONCAT('Invisible'...
Как исправить ошибки в Null.dll
Большинство ошибок null.dll связано с отсутствием или повреждениями файлов null.dll. Здесь перечислены пять самых распространенных
Заметка про NULL / Хабр
Даже выражение NULL != NULL не будет истинным, ведь нельзя однозначно сравнить одну неизвестность с другой. Кстати, ложным это выражение тоже не будет, потому что при вычислении условий Oracle не ограничивается состояниями ИСТИНА и ЛОЖЬ.