Replacing NULL with 0 in a SQL server query - Stack Overflow
When you want to replace a possibly null column with something else, use IsNull. SELECT ISNULL(myColumn, 0 ) FROM myTable. This will put a 0 in myColumn if it is null in the first place.
sql - Counting null values as unique value - Stack Overflow
Select count(distinct col1) + count(distinct case when col1 is null then 1 end) from YourTable.
sql - How return a count(*) of 0 instead of NULL - Stack Overflow
You can't select the values from the table when the row count is 0. Where would it get the values for the nonexistent rows? To do this, you'll have to have another table that defines your list of valid Project and Financial_Year values. You'll then select from this table, perform a left join on your existing table...
SQL using If Not Null on a Concatenation - Stack Overflow
...string as being equivalent to NULL, which determines whether concatenating a NULL yields a NULL or not.
select - Display both null and not null under same id but not both null...
Count(column) and count(*) will differ if NULL exists: SELECT ID, Col1 FROM #TestData WHERE id IN (. SELECT id FROM #TestData GROUP BY id HAVING COUNT(*) > COUNT(Col1) -- at least one NULL.
PostgreSQL: Comments within SQL
SELECT order_detail_id, quantity -- Author: TechOnTheNet.com FROM order_details; Example - Comment on Multiple Lines.
COUNT (Transact-SQL) - SQL Server | Microsoft Docs
Сюда входят значения NULL и повторяющиеся значения.This includes NULL values and duplicates.
Шпаргалка по SQL инъекциям | DefconRU
11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- Если нет ошибки, значит синтаксис верный, т.е. используется MS SQL
Внедрение SQL-кода — Википедия
-1 UNION SELECT group_concat(username, 0x3a, password) FROM admin.