constraints - accepting only alphabets in varchar2 using check constraint in sql

Question

I have a table with a column name of datatype varchar2. How can I use check constraint on name such that it will not accept NUMERIC VALUES AS WELL AS SPECIAL CHARACTERS in it?????

Answer 1

假设您使用的是 ms sql

ALTER TABLE table
ADD
CONSTRAINT column_alpha_check
CHECK
(
     field like '%[^abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ]%'
)

还

在 SQL 中，您可以增强功能来做到这一点