| 在 SELECT 语句中使用函数 / 时间函数 | |
图: 查询
SELECT customer_num,
WEEKDAY (call_dtime) called,
WEEKDAY (res_dtime) resolved
FROM cust_calls
ORDER BY resolved;
图: 查询结果
customer_num called resolved
127 3
110 0 0
119 1 2
121 3 3
116 3 3
106 3 3
116 5 4
图: 查询
SELECT COUNT(*)
FROM cust_calls
WHERE WEEKDAY (call_dtime) IN (0,6);
图: 查询结果
(count(*))
4