sql分组显示当天、昨天，本周，上周的记录数

1、分组显示（以0-23h形式）当天（今天）的记录数，注：tblorder是指查询的表，oAuditTime是指表中的时间字段

SELECT
HOUR (oAuditTime),
count(*)
FROM
tblorder
WHERE
to_days(oAuditTime) = to_days(curdate())
GROUP BY
HOUR (oAuditTime)

2、分组显示（以0-23h形式）昨天的记录数，注：tblorder是指查询的表，oAuditTime是指表中的时间字段

SELECT
HOUR (oAuditTime),
count(*)
FROM
tblorder
WHERE
to_days(oAuditTime) = to_days(
DATE_SUB(CURRENT_DATE, INTERVAL 1 DAY)
)
GROUP BY
HOUR (oAuditTime)

3、分组显示本周（周一为0，周二为1....周日为6）的记录数，注：tblorder是指查询的表，oAuditTime是指表中的时间字段

SELECT
WEEKDAY(oAuditTime),
COUNT(*)
FROM
tblorder
WHERE
oAuditTime >= (
SELECT
subdate(
curdate(),
date_format(curdate(), '%w') - 1
)
)
AND oAuditTime < (
SELECT
subdate(
curdate(),
date_format(curdate(), '%w') - 8
)
)
GROUP BY
WEEKDAY(oAuditTime)

4、分组显示上周（周一为0，周二为1....周日为6）的记录数，注：tblorder是指查询的表，oAuditTime是指表中的时间字段

SELECT
WEEKDAY(oAuditTime),
COUNT(*)
FROM
tblorder
WHERE
oAuditTime >= (
SELECT
subdate(
curdate(),
date_format(curdate(), '%w') + 6
)
)
AND oAuditTime < (
SELECT
subdate(
curdate(),
date_format(curdate(), '%w') - 1
)
)
GROUP BY
WEEKDAY(oAuditTime)

5、显示mysql当前所有的连接数

show status like 'Threads_connected%';