DW
发帖数: 535 | 1 In the table, there are two columns, one is calleld start_letter and the other
is called end_letter. The type of both of them is Char(1). The condition is
end_letter must be greater than start_letter. So what I write like this:
start_letter CHAR(1) NOT NULL,
end_letter CHAR(1) NOT NULL CHECK(end_letter>start_letter)
The error message is
ORA-02438: Column check constraint cannot reference other columns
How should I do to set this condition?
Thank you! |
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