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• int : Á¤¼öÇü • tynyint : ºÎÈ£ ÀÖ´Â Á¤¼ö -128 ~ 127, ºÎÈ£ ¾ø´Â Á¤¼ö 0 ~255, 1 Byte • smallint : ºÎÈ£ ÀÖ´Â Á¤¼ö -32768 ~ 32767, ºÎÈ£ ¾ø´Â Á¤¼ö 0 ~65535, 2 Byte • mediumint : ºÎÈ£ ÀÖ´Â Á¤¼ö -8388608 ~ 8388607, ºÎÈ£ ¾ø´Â Á¤¼ö 0 ~16777215, 3 Byte • int/integer : ºÎÈ£ ÀÖ´Â Á¤¼ö -2147483648 ~ 2147483647, ºÎÈ£ ¾ø´Â Á¤¼ö 0 ~4294967295, 4 Byte • bigint : ºÎÈ£ ÀÖ´Â Á¤¼ö -9223372036854775808 ~ 9223372036854775807, ºÎÈ£ ¾ø´Â Á¤¼ö 0 ~18446744073709551615, 8 Byte • float : ´ÜÀÏ Á¤¹Ðµµ¸¦ °¡Áø ºÎµ¿ ¼Ò¼öÁ¡, -3.402823466E+38 ~3.402823466E+38 • double : 2 ¹è Á¤¹Ðµµ¸¦ °¡Áø ºÎµ¿ ¼Ò¼öÁ¡, -1.79769313486231517E+308 ~ 1.79769313486231517E+308 • char(m) : °íÁ¤±æÀÌ ¹®ÀÚ¿À» Ç¥ÇöÇÏ´Â À¯Çü, M = 1 ~255 • varchar(m) : °¡º¯±æÀÌ ¹®ÀÚ¿À» Ç¥ÇöÇÏ´Â À¯Çü, M = 1 ~ 255 • text : ÃÖ´ë 65535°³ÀÇ ¹®ÀÚ¸¦ °¡º¯ÀûÀ¸·Î ÀÔ·Â • tinyblob (tinytext) : ÀÌÁø/¹®ÀÚ µ¥ÀÌŸ, ÃÖ´ëÅ©±â 255 (2^8 - 1) characters. blob´Â binary large objectÀÇ ¾àÀÚ • blob (text) : ÀÌÁø/¹®ÀÚ µ¥ÀÌŸ, ÃÖ´ëÅ©±â 65535 (2^16 - 1) characters. • mediumblob (mediumtext) : ÀÌÁø/¹®ÀÚ µ¥ÀÌŸ, ÃÖ´ëÅ©±â 16777215 (2^24 - 1) characters. • longblob(longtext) : ÀÌÁø/¹®ÀÚ µ¥ÀÌŸ, ÃÖ´ëÅ©±â 4294967295 (2^32 - 1) characters. • date : ³¯Â¥¸¦ Ç¥ÇöÇÏ´Â À¯Çü, 1000-01-01 ~ 9999-12-31 • datetime : ³¯Â¥¿Í ½Ã°£À» Ç¥ÇöÇÏ´Â À¯Çü, 1000-01-01 00:00:00 ~ 9999-12-31 23:59:59 • timestamp : 1970-01-01 00:00:00 ºÎÅÍ 2037³â ±îÁö Ç¥Çö, 4 Byte • time : ½Ã°£À» Ç¥ÇöÇÏ´Â À¯Çü, -839:59:59 ~ 838:59:59 • year : ³âµµ¸¦ Ç¥ÇöÇÏ´Â À¯Çü, 1901 ³â ~ 2155³â |
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• ABS(¼ýÀÚ) : Àý´ë°ª Ãâ·Â. select abs(123); • CEILING(¼ýÀÚ) : °ªº¸´Ù Å« Á¤¼ö Áß °¡Àå ÀÛÀº ¼ö. -¾ç¼öÀÏ °æ¿ì´Â ¼Ò¼ýÁ¡ ÀÚ¸®¿¡¼ ¹«Á¶°Ç ¹Ý¿Ã¸²(4.0°ú °°Àº ¼Ò¼ýÁ¡ ÀÚ¸® 0 °ªÀº Á¦¿Ü) -À½¼öÀÏ °æ¿ì´Â ¼Ò¼ýÁ¡ ÀÚ¸®¸¦ ¹«Á¶°Ç ¹ö¸² select ceiling(4.0); select ceiling(4.1); select ceiling(4.9); • FLOOR(¼ýÀÚ) : °ªº¸´Ù ÀÛÀº Á¤¼ö Áß °¡Àå Å« ¼ö[½Ç¼ö¸¦ ¹«Á¶°Ç ¹ö¸²(À½¼öÀÏ °æ¿ì´Â Á¦¿Ü)]. -À½¼öÀÏ °æ¿ì´Â [.0/.00/.000/...] À» Á¦¿ÜÇÏ°í ¹«Á¶°Ç ¼Ò¼ýÁ¡À» ¹ö¸®°í ¹Ý³»¸²(?) select floor(4.0); select floor(4.1); select floor(4.9); select floor(-4.6789); • ROUND(¼ýÀÚ,ÀÚ¸´¼ö) : ¼ýÀÚ¸¦ ¼Ò¼öÁ¡ ÀÌÇÏ ÀÚ¸´¼ö¿¡¼ ¹Ý¿Ã¸².(ÀÚ¸´¼ö´Â ¾ç¼ö,0,À½¼ö¸¦ °®À» ¼ö ÀÖ´Ù. »ý·«ÇÏ¸é µðÆúÆ® 0 ÀÌ µÈ´Ù.) -ÀÚ¸´¼ö¸¦ »ý·«ÇÏ¸é ¼Ò¼ýÁ¡ÀÌ 5 ÀÌ»óÀÏ ¶§ ¹Ý¿Ã¸²/ÀÚ¸´¼ö¸¦ ÁöÁ¤Çϸé ÁöÁ¤ÇÑ ÀÚ¸®¼ö¿¡¼ ¹Ý¿Ã¸² select round(4.5); °á°ú°ªÀº 4 / ÀÚ¸´¼ö¸¦ »ý·«ÇÏ¸é ¼Ò¼ýÁ¡ÀÌ 5 ÀÌ»óÀÏ ¶§ ¹Ý¿Ã¸²À» ÇÏ¸ç ¼Ò¼ýÁ¡ ù°ÀÚ¸®±îÁö´Â 6 ÀÌ»óÀ̾î¾ß ¹Ý¿Ã¸² select round(4.55); select round(-4.5);°á°ú°ªÀº -5 / À½¼öÀÏ °æ¿ì´Â ÀÚ¸´¼ö¸¦ »ý·«ÇÏ¸é ¼Ò¼ýÁ¡ÀÌ 5 ÀÌ»óÀÏ ¶§ ¹Ý³»¸².(¼Ò¼ýÁ¡ ù°ÀÚ¸® ¿ª½Ã 5 ÀÌ»óÀÌ¸é ¹Ý³»¸²) select round(4.556);°á°ú°ªÀº 5 select round(4.556,0);°á°ú°ªÀº 5 select round(4.556,1);°á°ú°ªÀº 4.6 select round(4.556,2);°á°ú°ªÀº 4.56 select round(45.556,-1);°á°ú°ªÀº 50 select round(455.556,-2);°á°ú°ªÀº 500 • TRUNCATE(¼ýÀÚ,ÀÚ¸´¼ö) : ¼ýÀÚ¸¦ ¼Ò¼öÁ¡ ÀÌÇÏ ÀÚ¸´¼ö¿¡¼ ¹ö¸². =>¸¸ÀÏ ÀÚ¸´¼ö¸¦ ¼Ò¼ýÁ¡ ÀÌÀüÀ¸·Î Á¤ÇÏ¸é ¼Ò¼ýÁ¡ÀÌÇÏ´Â ¹ö¸®°í ³ª¸ÓÁö °ªÀº 0 °ªÀ¸·Î ó¸® ¿¹) truncate(9999,-3) -> 9000 =>¶Ç´Â ÀÚ¸´¼ö¸¦ ¼Ò¼ýÁ¡ÀÌÇÏ·Î Á¤Çϸç, ÇØ´ç¼ýÀÚ°¡ ÀÚ¸´¼öº¸´Ù ¼Ò¼ýÁ¡ÀÌ ¸ðÀÚ¶ö°æ¿ì 0 °ªÀ¸·Î ´ëÄ¡ ¿¹) truncate(999,3) -> 999.000 -¹Ýµå½Ã ÀÚ¸´¼ö¸¦ ¸í½ÃÇØÁÖ¾î¾ß ÇÑ´Ù -À½¼öÀÏ °æ¿ì´Â ÇØ´çÀÚ¸´¼ö¿¡¼ ¼Ò¼ýÁ¡À» ¹ö¸®¸é¼ ¹«Á¶°Ç ¹Ý¿Ã¸² =>(ÀÚ¸´¼ö ¼ýÀÚ¿¡¼ ÀÌÈÄ ¼ýÀÚ°¡ 0 ÀÏ °æ¿ì´Â Á¦¿Ü / ¿¹)-4.0,0/-400,-2/-4.1230,4) =>À½¼ö ¿ª½Ã ÀÚ¸´¼ö¸¦ ¼Ò¼ýÁ¡ÀÌÇÏ·Î Á¤Çϸç, ÇØ´ç¼ýÀÚ°¡ ÀÚ¸´¼öº¸´Ù ¼Ò¼ýÁ¡ÀÌ ¸ðÀÚ¶ö°æ¿ì 0 °ªÀ¸·Î ´ëÄ¡ =>¶ÇÇÑ ÀÚ¸´¼ö¸¦ ¼Ò¼ýÁ¡ ÀÌÀüÀ¸·Î Á¤ÇÏ¸é ¼Ò¼ýÁ¡ÀÌÇÏ´Â ¹ö¸®°í ³ª¸ÓÁö °ªÀº ¿ª½Ã 0 °ªÀ¸·Î ó¸® • POW(X,Y) ¶Ç´Â POWER(X,Y) : XÀÇ Y½Â -¼Ò¼ýÁ¡ÀÌ ÀÖ´Â °æ¿ìµµ ½ÇÇà, ´Ü À½¼ö´Â ¾ç¼ö·Î ½Âó¸® select pow(-2.5,2); select pow(1.5,2); • MOD (ºÐÀÚ, ºÐ¸ð) : ºÐÀÚ¸¦ ºÐ¸ð·Î ³ª´« ³ª¸ÓÁö¸¦ ±¸ÇÑ´Ù.(¿¬»êÀÚ %¿Í °°À½) select mod(12,5); => 2 select 12%5; => 2 • GREATEST(¼ýÀÚ1,¼ýÀÚ2,¼ýÀÚ3...) : ÁÖ¾îÁø ¼ö Áß Á¦ÀÏ Å« ¼ö ¸®ÅÏ. select greatest(100,101,90); • LEAST(¼ýÀÚ1,¼ýÀÚ2,¼ýÀÚ3...) : ÁÖ¾îÁø ¼ö Áß Á¦ÀÏ ÀÛÀº ¼ö ¸®ÅÏ. select least(100,101,90); • INTERVAL(a,b,c,d.....) : a(¼ýÀÚ)ÀÇ À§Ä¡ ¹Ýȯ -µÎ ¹ø° ÀÌÈÄ´Â ¿À¸§Â÷¼ø Á¤·ÄÀÌ µÇ¾î¾ß ÇÔ ¿¹) INTERVAL(5,2,4,6,8) => 2 5´Â 4¿Í 6»çÀÌ¿¡ Á¸Àç, 4~6»çÀÌÀÇ À§Ä¡°¡ ¾Õ¿¡¼ 2¹ø° select interval(4,1,2,3,5,6);123~56 »çÀÌ¿¡ µé¾î°¡¹Ç·Î Ãâ·Â°ªÀº ¾Õ¿¡¼ºÎÅÍ 0,1,2,3 À̹ǷΠ3 ÀÌ µÈ´Ù. |
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• ASCII(¹®ÀÚ) : ¹®ÀÚÀÇ ¾Æ½ºÅ° Äڵ尪 ¸®ÅÏ. SELECT ASCII('¹®ÀÚ'); select ascii('A'); • CONCAT('¹®ÀÚ¿1','¹®ÀÚ¿2','¹®ÀÚ¿3'...) : ¹®ÀÚ¿µéÀ» À̾îÁØ´Ù. select concat('ASP,','PHP,','SQL',' WEB STUDY'); • INSERT('¹®ÀÚ¿','½ÃÀÛÀ§Ä¡','±æÀÌ','»õ·Î¿î¹®ÀÚ¿') : ¹®ÀÚ¿ÀÇ ½ÃÀÛÀ§Ä¡ºÎÅÍ ±æÀ̸¸Å »õ·Î¿î ¹®ÀÚ¿·Î ´ëÄ¡ '½ÃÀÛÀ§Ä¡' ¿Í '±æÀÌ'´Â ¹®ÀÚ¿ÀÌ ¾Æ´Ï¹Ç·Î ÀÛÀºµû¿ÈÇ¥·Î ±»ÀÌ ¹¾îÁÖÁö ¾Ê¾Æµµ µÈ´Ù. select insert('MySql web study','7','3','offline'); select insert('MySql web study',7,3,'offline'); • REPLACE('¹®ÀÚ¿','±âÁ¸¹®ÀÚ¿','¹Ù²ð¹®ÀÚ¿') : ¹®ÀÚ¿ Áß ±âÁ¸¹®ÀÚ¿À» ¹Ù²ð ¹®ÀÚ¿·Î ¹Ù²Û´Ù. select replace('MySql web study','web','offline'); • INSTR('¹®ÀÚ¿','ã´Â¹®ÀÚ¿') : ¹®ÀÚ¿ Áß Ã£´Â ¹®ÀÚ¿ÀÇ À§Ä¡°ªÀ» Ãâ·Â -°ªÀÌ Á¸ÀçÇÏÁö ¾ÊÀ¸¸é 0°ª ¸®ÅÏ select instr('MySql web study','s'); select instr('MySql web study','S'); • LEFT('¹®ÀÚ¿',°³¼ö) : ¹®ÀÚ¿ Áß ¿ÞÂÊ¿¡¼ °³¼ö¸¸ÅÀ» ÃßÃâ. select left('MySql web study',5); select left('MySql web study','5'); • RIGHT('¹®ÀÚ¿',°³¼ö) : ¹®ÀÚ¿ Áß ¿À¸¥ÂÊ¿¡¼ °³¼ö¸¸ÅÀ» ÃßÃâ. select right('MySql web study',5); select right('MySql web study','5'); • MID('¹®ÀÚ¿',½ÃÀÛÀ§Ä¡,°³¼ö) : ¹®ÀÚ¿ Áß ½ÃÀÛÀ§Ä¡ºÎÅÍ °³¼ö¸¸Å Ãâ·Â select mid('MySql web study',7,3); select mid('MySql web study','7','3'); • SUBSTRING('¹®ÀÚ¿',½ÃÀÛÀ§Ä¡,°³¼ö) : ¹®ÀÚ¿ Áß ½ÃÀÛÀ§Ä¡ºÎÅÍ °³¼ö¸¸Å Ãâ·Â select substring('Mysql web study',11,5); select substring('Mysql web study','11','5'); • LTRIM('¹®ÀÚ¿') : ¹®ÀÚ¿ Áß ¿ÞÂÊÀÇ °ø¹éÀ» ¾ø¾Ø´Ù. select ltrim(' web study'); • RTRIM('¹®ÀÚ¿') : ¹®ÀÚ¿ Áß ¿À¸¥ÂÊÀÇ °ø¹éÀ» ¾ø¾Ø´Ù. select rtrim('web study '); • TRIM('¹®ÀÚ¿') : ¾çÂÊ ¸ðµÎÀÇ °ø¹éÀ» ¾ø¾Ø´Ù. select trim(' web study '); • LCASE('¹®ÀÚ¿') ¶Ç´Â LOWER('¹®ÀÚ¿') : ¼Ò¹®ÀÚ·Î ¹Ù²Û´Ù. select lcase('MYSQL'); select lower('MySQL'); • UCASE('¹®ÀÚ¿') ¶Ç´Â UPPER('¹®ÀÚ¿') : ´ë¹®ÀÚ·Î ¹Ù²Û´Ù. select ucase('mySql'); select upper('mysql'); • REVERSE('¹®ÀÚ¿') : ¹®ÀÚ¿À» ¹Ý´ë·Î ³ª¿ÇÑ´Ù. ¿¹) REVERSE('abcde') => edcba select reverse('lqSyM'); |
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• IF(³í¸®½Ä,ÂüÀÏ ¶§ °ª,°ÅÁþÀÏ ¶§ °ª) : ³í¸®½ÄÀÌ ÂüÀ̸é ÂüÀÏ ¶§ °ªÀ» Ãâ·ÂÇÏ°í ³í¸®½ÄÀÌ °ÅÁþÀÌ¸é °ÅÁþÀÏ ¶§ Ãâ·ÂÇÑ´Ù. • IFNULL(°ª1,°ª2) : MS-SQL ÀÇ ISNULL ±â´É°ú °°´Ù. °ª1ÀÌ NULL ÀÌ¸é °ª2·Î ´ëÄ¡ÇÏ°í ±×·¸Áö ¾ÊÀ¸¸é °ª1À» Ãâ·Â |
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• COUNT(Çʵå¸í) : ¼±ÅÃÇÑ Ä÷³ÀÇ ÀüüÇàÀÇ ¼ö¸¦ ¹Ýȯ. • SUM(Çʵå¸í) : °¢ Çʵ尪ÀÇ Çհ踦 ¹Ýȯ. • AVG(Çʵå¸í) : °¢ Çʵ尪ÀÇ Æò±Õ°ªÀ» ¹Ýȯ. • MAX(Çʵå¸í) : Çʵ尪 Áß ÃÖ´ë°ªÀ» ¹Ýȯ. • MIN(Çʵå¸í) : Çʵ尪 Áß ÃÖ¼Ò°ªÀ» ¹Ýȯ. |
¢º ³¯Â¥ °ü·Ã ÇÔ¼ö | |||||||||||||||||||||||||||||||||
• NOW(), SYSDATE(), CURRENT_TIMESTAMP() : ÇöÀç ³¯Â¥¿Í ½Ã°£ Ãâ·Â ¡Ø ÇÔ¼öÀÇ »óȲÀÌ ¼ýÀÚÀÎÁö ¹®ÀÚ¿ÀÎÁö¿¡ µû¶ó YYYYMMDDHHMMSS ¶Ç´Â 'YYYY-MM-DD HH:MM:SS' Çü½ÄÀ¸·Î ¹ÝȯÇÑ´Ù. ¿¹) select now(); => '2001-05-07 09:10:10' select now() + 0; => 20010507091010 • CURDATE(), CURRENT_DATE() : ÇöÀç ³¯Â¥ Ãâ·Â ¡Ø ÇÔ¼öÀÇ »óȲÀÌ ¼ýÀÚÀÎÁö ¹®ÀÚ¿ÀÎÁö¿¡ µû¶ó YYYYMMDD ¶Ç´Â 'YYYY-MM-DD Çü½ÄÀ¸·Î ¹ÝȯÇÑ´Ù. ¿¹) select curdate(); => '2001-05-07' select curdate() + 0; => 20010507 • CURTIME(), CURRENT_TIME() : ÇöÀç ½Ã°£ Ãâ·Â ¡Ø ÇÔ¼öÀÇ »óȲÀÌ ¼ýÀÚÀÎÁö ¹®ÀÚ¿ÀÎÁö¿¡ µû¶ó HHMMSS ¶Ç´Â 'HH:MM:SS' Çü½ÄÀ¸·Î ¹ÝȯÇÑ´Ù. ¿¹) select curtime(); => '09:10:10' select curtime() + 0; => 091010 • DATE_ADD(³¯Â¥,INTERVAL ±âÁØ°ª) : ³¯Â¥¿¡¼ ±âÁØ°ª ¸¸Å ´õÇÑ´Ù. ¡Ø ±âÁØ°ª : YEAR, MONTH, DAY, HOUR, MINUTE, SECOND ¿¹) select date_add(now(), interval 2 day); => ¿À´Ãº¸´Ù 2ÀÏ ÈÄÀÇ ³¯Â¥¿Í ½Ã°£ Ãâ·Â. select date_add(curdate(), interval 2 day); => ¿À´Ãº¸´Ù 2ÀÏ ÈÄÀÇ ³¯Â¥ Ãâ·Â. • DATE_SUB(³¯Â¥,INTERVAL ±âÁØ°ª) ³¯Â¥¿¡¼ ±âÁØ°ª ¸¸Å –A´Ù. ¡Ø ±âÁØ°ª : YEAR, MONTH, DAY, HOUR, MINUTE, SECOND select date_sub(now(),interval 2 day); => ¿À´Ãº¸´Ù 2ÀÏ ÀüÀÇ ³¯Â¥¿Í ½Ã°£ Ãâ·Â. select date_sub(curdate(), interval 2 day); => ¿À´Ãº¸´Ù 2ÀÏ ÀüÀÇ ³¯Â¥ Ãâ·Â. • YEAR(³¯Â¥) : ³¯Â¥ÀÇ ¿¬µµ Ãâ·Â. select year('20000101'); select year(20000101); select year('2000-01-01'); select year(now()); select year(curdate()); select year(date_add(now(),interval 2 year)); select year(date_sub(curdate(),interval 2 year)); • MONTH(³¯Â¥) : ³¯Â¥ÀÇ ¿ù Ãâ·Â. select month('20001231'); select month(20001231); select month('2000-12-31'); select month(now()); select month(curdate()); select month(date_add(now(),interval 2 month)); select month(date_sub(curdate(),interval 2 month)); • MONTHNAME(³¯Â¥) : ³¯Â¥ÀÇ ¿ùÀ» ¿µ¾î·Î Ãâ·Â. select monthname(20021221); select monthname('20000721'); select monthname('2000-08-10'); select monthname(now()); select monthname(curdate()); select monthname(date_add(now(),interval 17 month)); select monthname(date_sub(curdate(),interval 11 month)); • DAYNAME(³¯Â¥) : ³¯Â¥ÀÇ ¿äÀÏÀÏ ¿µ¾î·Î Ãâ·Â. select dayname(20000121); select dayname('20010123'); select dayname('2001-06-22'); select dayname(now()); select dayname(curdate()); select dayname(date_add(now(),interval 21 day)); select dayname(date_sub(curdate(),interval 333 day)); • DAYOFMONTH(³¯Â¥) : ³¯Â¥ÀÇ ¿ùº° ÀÏÀÚ Ãâ·Â. select dayofmonth(20030112); select dayofmonth('20011231'); select dayofmonth('2001-12-23'); select dayofmonth(now()); select dayofmonth(curdate()); select dayofmonth(date_add(now(),interval 56 day)); select dayofmonth(date_sub(curdate(),interval 33 day)); • DAYOFWEEK(³¯Â¥) : ³¯Â¥ÀÇ ÁÖº° ÀÏÀÚ Ãâ·Â(¿ù¿äÀÏ(0),È¿äÀÏ(1)...ÀÏ¿äÀÏ(6)) select dayofweek(20011209); select dayofweek('20001212'); select dayofweek('2003-03-21'); select dayofweek(now()); select dayofweek(curdate()); select dayofweek(date_add(now(),interval 23 day)); select dayofweek(date_sub(curdate(),interval 31 day)); • WEEKDAY(³¯Â¥) : ³¯Â¥ÀÇ ÁÖº° ÀÏÀÚ Ãâ·Â(¿ù¿äÀÏ(0),È¿äÀÏ(1)...ÀÏ¿äÀÏ(6)) select weekday(20000101); select weekday('20030223'); select weekday('2002-10-26'); select weekday(now()); select weekday(curdate()); select weekday(date_add(now(),interval 23 day)); select weekday(date_sub(curdate(),interval 33 day)); • DAYOFYEAR(³¯Â¥) : ÀϳâÀ» ±âÁØÀ¸·Î ÇÑ ³¯Â¥±îÁöÀÇ ³¯ ¼ö. select dayofyear(20020724); select dayofyear('20001231'); select dayofyear('2002-01-01'); select dayofyear(now()); select dayofyear(curdate()); select dayofyear(date_add(curdate(),interval 44 year)); select dayofyear(date_sub(now(),interval 25 month)); select dayofyear(date_add(now(),interval 55 day)); select dayofyear(date_sub(curdate(),interval 777 hour)); select dayofyear(date_add(now(),interval 999999 minute)); • WEEK(³¯Â¥) : Àϳâ Áß ¸î ¹ø¤Š ÁÖ. select week(now()); select week(date_sub(curdate(),interval 12 month)); • FROM_DAYS(³¯ ¼ö) -00³â 00¿ù 00ÀϺÎÅÍ ³¯ ¼ö ¸¸Å °æ°úÇÑ ³¯ÀÇ ³¯Â¥ Ãâ·Â. ¡Ø ³¯ ¼ö´Â 366 ÀÌ»óÀ» ÀÔ·Â ±× ÀÌÇÏ´Â ¹«Á¶°Ç '0000-00-00' À¸·Î Ãâ·Â. -¶ÇÇÑ 9999-12-31 [from_days(3652424)] ±îÁöÀÇ ³¯Â¥°¡ Ãâ·Â°¡´É ÇÏ´Ù°í´Â Çϳª Á¤È®È÷ ¸»Çϸé 0000-03-15 [from_days(3652499)] ±îÁöÀÇ ³¯Â¥°¡ Ãâ·Â°¡´ÉÇÔ. -µû¶ó¼ ³¯ ¼ö´Â 366 ÀÌ»ó 3652424[3652499] ÀÌÇÏ°¡ µÇ¾î¾ß ÇÑ´Ù. select from_days(3652424); select from_days('3652499'); • TO_DAYS(³¯Â¥) -00 ³â 00 ¿ù 00ÀÏ ºÎÅÍ ³¯Â¥±îÁöÀÇ ÀÏÀÚ ¼ö Ãâ·Â. -from_days¿Í ºñ±³ÇØ º¼ ¶§ Á¤È®ÇÑ ³¯Â¥¹üÀ§´Â 3652424 ÀÏ ¼ö ±îÁöÀÓÀ» ¾Ë ¼ö ÀÖ´Ù. select to_days('99991231'); select to_days('0000-03-15'); ÀÀ¿ë ¿¹Á¦1) ÀÚ½ÅÀÌ »ì¾Æ ¿Â ³¯¼ö select to_days(now()) - to_days('º»ÀλýÀÏÀÚ'); select to_days(now()) - to_days('1970-10-10'); ÀÀ¿ë ¿¹Á¦2) »ì¾Æ ¿Â ³¯¼ö¸¦ ÀÌ¿ëÇÏ¿© ÀÚ½ÅÀÇ ³ªÀ̸¦ ¸¸À¸·Î ±¸Çϱâ select (to_days(now())-to_days('1970-10-10'))/365; select floor((to_days(now())-to_days('19701010'))/365); • DATE_FORMAT(³¯Â¥,'Çü½Ä') : ³¯Â¥¸¦ Çü½Ä¿¡ ¸Â°Ô Ãâ·Â
¿¹) select date_format(now(),'%Y:%M:%p'); => 2001:May:PM • DATABASE() : ÇöÀçÀÇ µ¥ÀÌÅͺ£À̽º À̸§À» Ãâ·ÂÇÑ´Ù. • PASSWORD('¹®ÀÚ¿') : ¹®ÀÚ¿À» ¾ÏÈ£ÈÇÑ´Ù. • FORMAT(¼ýÀÚ,¼Ò¼öÀÌÇÏÀÚ¸®¼ö) : ¼ýÀÚ¸¦ #,###,###.## Çü½ÄÀ¸·Î Ãâ·Â -ÀÓÀÇÀÇ ¼Ò¼öÁ¡ÀÚ¸´¼ö¸¦ »ý¼ºÇÑ´Ù./¼Ò¼ýÁ¡À» ÇÊ¿äÇÑ ¸¸Å ÃëÇÑ´Ù. -¼Ò¼ýÁ¡À» ¸¸µé¾î °°Àº ±æÀÌ·Î ÇÑ´ÙÀ½ µ¿ÀÏÇÏ°Ô ÇÁ·Î±×·¥¿¡¼ ºÒ·¯¿Í¼ ¼Ò¼ýÁ¡À» ¹ö¸®°í ÇÊ¿äÇÑ °÷¿¡ Ãâ·ÂÇÏ´Â µî¿¡ ÀÀ¿ëÇÒ ¼ö ÀÖ´Ù. select format(123,5); select format(123.12345600123,9); select format(123.123,-3); ¡Ø ¼Ò¼ýÁ¡ÀÌÇÏÀÚ¸®¼ö°¡ 0 À̳ª À½¼ö°ªÀº ÇØ´çÀÌ ¾ÈµÊ |
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