What are the Oracle query time statements?

Oracle query time statements include: 1. Query the year of the time, the code is [select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss')]; 2. Query the month of the time, the code It is [select to_char(sysdate,'mm')].

Oracle query time statements include:

Convert date to string

select to_char(sysdate,’yyyy-mm-dd hh24:mi:ss’) as nowTime from dual;

Get time Year

select to_char(sysdate,’yyyy’) as nowYear from dual;

Get the month of the time

select to_char(sysdate,’mm’) as nowMonth from dual;

Get the day of the time

select to_char(sysdate,’dd’) as nowDay from dual;

Get the hour of the time

select to_char(sysdate,’hh24′) as nowHour from dual;

Get the minute of the time

select to_char(sysdate,’mi’) as nowMinute from dual;

Get the seconds of time

select to_char(sysdate,’ss’) as nowSecond from dual;

oracle date format

to_date("String to be converted","Converted format" ) The formats of the two parameters must match, otherwise an error will be reported. That is, the first parameter is interpreted in the format of the second parameter.

to_char(Date,"Conversion Format") That is, convert the given date according to the "Conversion Format".

Conversion format:

• Represents year: y represents the last digit of the year yy represents the last two digits of the year yyy represents the year The last three digits yyyy use 4 digits to represent the year

• represents month: mm uses 2 digits to represent the month; mon uses an abbreviated form such as November or nov; month uses the full name such as November Or november

• means day: dd means the day of the month; ddd means the day of the year; dy means the day of the week, such as Friday or fri; day means the day of the week. Write it in full, such as Friday or Friday.

• means hour: hh 2 digits means hour in hexadecimal; hh24 2 digits means hour 24 hours

• means minute: mi 2 digits represents the minute

• represents the second: ss 2 digits represents the second in hexadecimal

• represents the quarter: q One ​​digit The number represents the quarter (1-4)

. In addition, ww is used to represent the week of the year; w is used to represent the week of the month. weeks.

Time range under 24-hour format: 00:00:00-23:59:59

Time range under 12-hour format: 1:00:00-12:59:59

For example:

select to_char(sysdate,’yy-mm-dd hh24:mi:ss’) from dual //显示：08-11-07 13:22:42
select to_date(‘2005-12-25,13:25:59′,’yyyy-mm-dd,hh24:mi:ss’) from dual //显示：2005-12-25 13:25:59

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