We are updating a field in sql and alter

Modifies a table definition by altering, adding, or dropping columns and constraints, reassigning and rebuilding partitions, or disabling or enabling constraints and triggers.

Transact-SQL Syntax Conventions Is the name of the table to be altered.

If not specified, the column is assigned the default collation of the database.

If the new column does not allow null values and the table is not empty, a DEFAULT definition must be added with the new column, and the new column automatically loads with the default value in the new columns in each existing row.The null values must be updated to some value before the ALTER COLUMN NOT NULL is allowed, for example: When you create or alter a table with the CREATE TABLE or ALTER TABLE statements, the database and session settings influence and possibly override the nullability of the data type that is used in a column definition.We recommend that you always explicitly define a column as NULL or NOT NULL for noncomputed columns.NULL | NOT NULL Specifies whether the column can accept null values.Columns that do not allow null values can be added with ALTER TABLE only if they have a default specified or if the table is empty.

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