oracle to_char 日期转换字符串（Oracle to_char日期转换字符串）.docVIP

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oracle to_char 日期转换字符串（Oracle to_char日期转换字符串）.doc

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oracle to_char 日期转换字符串（Oracle to_char日期转换字符串）

oracle to_char 日期转换字符串（Oracle to_char日期转换字符串） 1 is shown in 12 hours SQLselect to_char (sysdate,YYYY-MM-DD, HH12:MI:SS, AM) from dual; TO_CHAR (SYSDATE,YYYY-MM-DDHH1) The 2007-06-29 02:50:06 PM 2 is shown in 24 hours SQL, select, to_char (sysdate,YYYY-MM-DD, HH24:MI:SS, AM) from dual; TO_CHAR (SYSDATE,YYYY-MM-DDHH2) The 2007-06-29 15:00:58 PM 3 gets the first minute of the current time Select to_char (Sysdate-1/21/60,HH24:MI:SS) from dual; TO_CHAR (SYSDATE-1/21/60,HH24:) The 15:00:54 4 gets one minute after the current time Select to_char (Sysdate+1/21/60,HH24:MI:SS) from dual; TO_CHAR (SYSDATE+1/21/60,HH24:) The 15:03:53 5 gets one hour before the current time Select to_char (Sysdate-1/24,HH24:MI:SS) from dual; TO_CHAR (SYSDATE-1/24,HH24:MI:) The 14:03:13 6 gets one hour after the current time Select to_char (Sysdate+1/24,HH24:MI:SS) from dual; TO_CHAR (SYSDATE+1/24,HH24:MI:) The 16:03:32 7 gets the day after the current time Select to_char (Sysdate+1,YYYY-MM-DD) from dual; TO_CHAR (SYSDATE+1,YYYY-MM-DD) The Query the first six months of the current time Select add_months (sysdate, -6) from dual 1, conversion function The most important thing to do with the date operation is the two translation function: to_date (), to_char () To_date () acts to convert character types into a date type in a certain format: Specific usage: to_date (2004-11-27,yyyy-mm-dd), the former is a string, the latter is the conversion date format, note that the front and back should be one-to-one correspondence. For example, to_date (2004-11-27, 13:34:43,yyyy-mm-dd, hh24:mi:ss) will get the exact time Multiple date formats: YYYY: the year in which the four bit represents YYY, YY, Y: the last three, two or one of the year, default to the current century MM:01~12s month number MONTH: nine characters representing the month, and the right side is filled with spaces MON: abbreviation for three digit month WW: the week of the year D: what day of the week? DD: the first few days of the month? DDD: wh