Sql Server添加列并使用默认值填充已有记录

alter语法

ALTER TABLE {TABLENAME} 
ADD {COLUMNNAME} {TYPE} {NULL|NOT NULL} 
CONSTRAINT {CONSTRAINT_NAME} DEFAULT {DEFAULT_VALUE}
WITH VALUES

ALTER TABLE SomeTable
        ADD SomeCol Bit NULL --Or NOT NULL.
 CONSTRAINT D_SomeTable_SomeCol --When Omitted a Default-Constraint Name is autogenerated.
    DEFAULT (0)--Optional Default-Constraint.
WITH VALUES --Add if Column is Nullable and you want the Default Value for Existing Records.

测试代码

alter table tblRecords add [外观] int default 0 WITH VALUES;

参考资料

https://stackoverflow.com/questions/92082/add-a-column-with-a-default-value-to-an-existing-table-in-sql-server