MySQL
For the value range of each type and the valid format of the specified date value, see 7.3.6 Date and Time type.
Here is an example of using the date function. The following query Selects all records. The value of date_col is within the last 3
MySQL date data type and time type usage summary MySQL date type: Date format, storage space occupied, date range comparison.
Date type storage space date format date range
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For operations on string positions, the first position is marked as 1.
ASCII (str)
Returns the ASCII code value of the leftmost character of the string str. If Str is an empty string, returns 0. If STR is NULL, returns NULL.
Mysql> Select ASCII (' 2
MySQL date type: Date Format, storage space occupied, and date range comparison.Date type storage space date format date range-----------------------------------------------------------------------------------Datetime 8 bytes YYYY-MM-DD hh: mm: SS 10
MySQL obtains the current date and time stamp function bitsCN.com
MySQL returns the current date, time, and timestamp.
1.1 obtain the current date + time (date + time) function: now ()
Mysql> select now ();
+ ------- +
| Now () |
+ ------- +
| 22:2
You can check it later.
I,MySQLGet current date and time
Now (): Obtain the current date + time (date + time) function:
Mysql> select now ();
+ --------------------- +
| Now () |
+ --------------------- +
| 10:26:23 |
+ ----------
Mysql> SELECT something from Tbl_name
WHERE To_days (now ()) –to_days (date_col)
DayOfWeek (date)
Returns the week index of date (1 = Sunday, 2 = Monday, ...). 7 = Saturday). Index values are compliant with ODBC standards.
mysql> SELECT DayOfWeek ('
The following query selects the records for all date_col values within the last 30 days.
Mysql> SELECT something from Tbl_name
WHERE To_days (now ())-To_days (Date_col) DayOfWeek (date)
Returns the week index of date (1 = Sunday, 2 = Monday, ...). 7
[MySQL] converts the datetime format to bitsCN.com.
[MySQL] converts the datetime format
Here is an example of using the date function. The following query selects all records. The value of date_col is within the last 30 days: www.bitsCN.com
Mysql>
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