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时间差计算
2022-07-17 05:09:00 【倫之】
SELECT
TIMESTAMPDIFF(
HOUR,
psi.report_date,
psi.handle_date
) AS time
FROM
table_name psi
WHERE
psi.status = '3'计算report_date、handle_date这两个字段之间相差多少个小时。
复习:
SELECT
MAX(student_result) AS 最高分,
MIN(student_result) AS 最低分,
CAST(AVG(student_result) AS DECIMAL(10,2)) AS 平均分
FROM students
WHERE sex= '男'
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