How to add a not null to an already existing column in SQL Server?
10184
Altering a column: null to not null
106065
How to check if a Constraint exists in Sql server?
144338
Can I add a unique constraint that ignores existing violations?
83536
Get first non-null value per row
129385
How to check if a column exists in a SQL Server table?
21454
Adding an identity to an existing column
119157
How to rename something in SQL Server that has square brackets in the name?
62914
Insert null/empty value in sql datetime column by default
118065
Including null values in unpivoted column
127800
SQL: Using NULL values vs. default values
63897
How do I return a new IDENTITY column value from an SQLServer SELECT statement?
91377
Add Auto-Increment ID to existing table?
119655
How can I do a BEFORE UPDATED trigger with sql server?
156816
How automatically add 1 year date to an existing date in SQL Server
55022
How to exclude a column from SELECT query?
95344
How do I insert a row which contains a foreign key?
16236
Is it possible to enforce unique values in a column, excluding nulls?