開發中對mysql資料庫使用較多，本文記錄博主個人常用sql語法，後續及時更新
查詢近12周的資料
select
*from table_name where date_sub(curdate(),
interval
12 week)
<=
date
(date_create)
select
*from table_name where date_format(date_create,
'%y-%m'
)> date_format(date_sub(curdate(),
interval
12month),
'%y-%m'
)
select
*from table_name where timestampdiff(
minute
,date_create,
now())
<
30
select
*from table_name where timestampdiff(
hour
,date_create,
now())
<
24
select
*from table_name where to_days(date_create)
= to_days(
now())
select
*from table_name where datediff(date_create,
now())
=0
select
*from table_name where datediff(date_create,
now())
=-1
select
*from table_name where date_format(date_create,
'%y%m%d'
)= date_format(
'2020-03-31'
,'%y%m%d'
)
select
*from table_name where yearweek(date_format(date_create,
'%y-%m-%d'))
= yearweek(
now(
))
select
*from table_name where yearweek(date_format(date_create,
'%y-%m-%d'))
- yearweek(
now())
=-1
select
*from table_name where yearweek(date_format(date_create,
'%y-%m-%d'))
- yearweek(
now())
=-1
select
*from table_name where date_format(date_create,
'%y%m'
)= date_format(
now(),
'%y%m'
)
select
*from table_name where period_diff( date_format(
now(),
'%y%m'
), date_format( 時間欄位名,
'%y%m'))
=1
select
*from table_name where date_format(date_create,
'%y%m'
)= date_format(
'2020-03-31'
,'%y%m'
)
select
*from table_name where quarter(date_create)
=quarter(
now(
))
select
*from table_name where quarter(date_create)
=quarter(date_sub(
now(),
interval
1 quarter)
)
select
*from table_name where
year
(date_create)
=year
(now()
)
select
*from table_name where
year
(date_create)
=year
(date_sub(
now(),
interval
1year
))
select group_concat(
column
)from table_name
select
count
(colum)
as'num'
from table_name group
by colum
select
case
when age <
18then
'1'when age <
30then
'2'else
'-1'
end[col]
from
[table
]
select
case
[col]
when
'1'then
'1'when
'2'then
'2'else
'-1'
end[col]
from
[table
]
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