mod在查询表达式中抛出语法错误（缺少运算符）

Question

here is my code to find leap years:

Select first_name, last_name,birth_date
FROM students
WHERE MOD(year(birth_date),4) =0
AND MOD(year(birth_date),100) =0
AND MOD(year(birth_date),400) =0;

but it returns this:

Syntax error (missing operator) in query expression
'MOD(year(birth_date),4) =0
 AND MOD(year(birth_date),100) =0
 AND MOD(year(birth_date),400) =0;

and I can't figure out the problem

Answer 1

Guessing from the error statement, you are using MS ACCESS .

Syntax for mod is:

n1 mod n2

So, your query becomes (fixed):

SELECT first_name, last_name,birth_date
FROM students
WHERE year(birth_date) mod 4 = 0
AND (
    NOT year(birth_date) mod 100 = 0
    OR  year(birth_date) mod 400 = 0
);

or

SELECT first_name, last_name,birth_date
FROM students
WHERE (
    NOT year(birth_date) mod 100 = 0
    AND year(birth_date) mod 4   = 0
)   OR  year(birth_date) mod 400 = 0
;

Answer 2

Have you tried "%"? Just to examine if it's error from mod function, also, specify your DBMS would be helpful too,

Select first_name, last_name,birth_date FROM students WHERE year(birth_date)%4 =0 AND year(birth_date)%100 =0 AND year(birth_date)%400 =0;