sql - Union to handle NULL values - Stack Overflow
As shown below, I need not null values to be at the start of all output fields.
sql - CONCAT'ing NULL fields - Stack Overflow | Post as a guest
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?
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.
postgresql - UNION ALL, cast NULL as double... - Stack Overflow
In postgres, I'm getting an error when I try to union two tables where one table has a column (Amount) containing double precision data type...
999999.9 /**/union/**/all /**/select /**/cast...
select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database.
Google Переводчик
Бесплатный сервис Google позволяет мгновенно переводить слова, фразы и веб-страницы с английского на более чем 100 языков и обратно.
Replacing NULL with 0 in a SQL server query - Stack Overflow
I have developed a query, and in the results for the first three columns I get NULL. How can I replace it with 0?
SQL is null and = null - Stack Overflow
What is the difference between … and … and why does the latter not work?
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.
Заметка про NULL / Хабр
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравн��ния с NULLами.