MySQL: Add two columns when one or both may be null
94356
Addition with NULL values
74707
SQL Server: Is it possible to insert into two tables at the same time?
152144
Using mysql concat() in WHERE clause?
10831
Join table depending on value of column in main table
158985
Can a foreign key be NULL and/or duplicate?
83368
How to combine two QUERY results into one column
119038
Count where any 3 columns have values (not null)
132527
Unique constraint that allows empty values in MySQL
35430
selecting where two columns are in a set
56652
Cannot add a NOT NULL column with default value NULL in Sqlite3
41542
Combine Two SQL queries in one statement
25838
Mysql create trigger if not exist
88990
Swapping column values in MySQL
110097
How do I compare two columns in SQL?
110974
Switch id numbers of two rows in MySql
47887
NULL values in where clause
15054
Does PostgreSQL optimize adding columns with non-NULL DEFAULTs?