WHEN MATCHED clause fails if there's a NULL in the ON columns
139486
NULL value self comparison in a table
127800
SQL: Using NULL values vs. default values
102608
WITH ROLLUP WHERE x IS NULL
30272
Rejection of text containing SQL statements
15435
how to check if $1 and $2 are null?
50650
Return null for date_format when input is null in mysql
64531
Should I use != or  for not equal in T-SQL?
22992
How to specify null value in MS Access through the JDBC-ODBC bridge?
39863
MySQL: selecting rows where a column is null
73137
SQL: IF clause within WHERE clause
141930
Implementing a "Both, Either-or, but Not Null" Requirement in a Database
145333
How to apply a regex on a column fetched from DB
94883
Why does comparing a SQL date variable to null behave in this way?
2772
Is there a "null coalescing" operator in JavaScript?
34438
Column name or number of supplied values does not match table definition
106227
Using column alias in WHERE clause of MySQL query produces an error
52660
WHERE statement that selects everything (content and NULL)