CREATE TABLE 錛? content varchar(20) NOT NULL, writer varchar(10) NULL 錛?/ccid_code>
瀹氫箟涓涓垪鐨勮娉曞涓嬶細
col_name col_typy [col_attributes]
[general_attributes]
鍏朵腑鍒楀悕鐢眂ol_name 緇欏嚭銆傚垪鍚嶅彲鏈澶氬寘鍚?4涓瓧絎︼紝瀛楃鍖呮嫭瀛楁瘝銆佹暟瀛椼佷笅鍒掔嚎鍙婄編鍏冪鍙楓傚垪鍚嶅彲浠ュ悕瀛椾腑鍚堟硶鐨勪換浣曠鍙鳳紙鍖呮嫭鏁板瓧錛夊紑澶淬備絾鍒楀悕涓嶈兘瀹屽叏鐢辨暟瀛楃粍鎴愶紝鍥犱負閭f牱鍙兘浣垮叾涓庢暟鎹垎涓嶅紑銆侻ySQL淇濈暀璇稿SELECT銆丏ELETE鍜孋REATE榪欐牱鐨勮瘝錛岃繖浜涜瘝涓嶈兘鐢ㄥ仛鍒楀悕錛屼絾鏄嚱鏁板悕錛堝POS 鍜孧IN錛夋槸鍙互浣跨敤鐨勩?nbsp;
鍒楃被鍨媍ol_type琛ㄧず鍒楀彲瀛樺偍鐨勭壒瀹氬箋傚垪綾誨瀷璇存槑絎﹁繕鑳借〃紺哄瓨鏀懼湪鍒椾腑鐨勫肩殑鏈澶ч暱搴︺傚浜庢煇浜涚被鍨嬶紝鍙敤涓涓暟鍊兼槑紜湴璇存槑鍏墮暱搴︺傝屽彟澶栦竴浜涘鹼紝鍏墮暱搴︾敱綾誨瀷鍚嶈暣鍚備緥濡傦紝CHAR(10) 鏄庣‘鎸囧畾浜?0涓瓧絎︾殑闀垮害錛岃孴INYBLOB鍊奸殣鍚渶澶ч暱搴︿負255涓瓧絎︺傛湁鐨勭被鍨嬭鏄庣鍏佽鎸囧畾鏈澶х殑鏄劇ず瀹藉害錛堝嵆鏄劇ず鍊兼椂浣跨敤澶氬皯涓瓧絎︼級銆傛誕鐐圭被鍨嬪厑璁告寚瀹氬皬鏁頒綅鏁幫紝鎵浠ヨ兘鎺у埗嫻偣鏁扮殑綺懼害鍊間負澶氬皯銆?nbsp;
鍙互鍦ㄥ垪綾誨瀷涔嬪悗鎸囧畾鍙夌殑綾誨瀷璇存槑灞炴э紝浠ュ強鎸囧畾鏇村鐨勫父瑙佸睘鎬с傚睘鎬ц搗淇グ綾誨瀷鐨勪綔鐢紝騫舵洿鏀瑰叾澶勭悊鍒楀肩殑鏂瑰紡錛屽睘鎬ф湁浠ヤ笅綾誨瀷錛?nbsp;
錛?錛変笓鐢ㄥ睘鎬х敤浜庢寚瀹氬垪銆備緥濡傦紝UNSIGNED 灞炴у彧閽堝鏁村瀷錛岃孊INARY灞炴у彧鐢ㄤ簬CHAR 鍜孷ARCHAR銆?nbsp;
錛?錛夐氱敤灞炴ч櫎灝戞暟鍒椾箣澶栧彲鐢ㄤ簬浠繪剰鍒椼傚彲浠ユ寚瀹歂ULL 鎴朜OT NULL 浠ヨ〃紺烘煇涓垪鏄惁鑳藉瀛樻斁NULL銆傝繕鍙互鐢―EFAULT錛宒ef_value 鏉ヨ〃紺哄湪鍒涘緩涓涓柊琛屼絾鏈槑紜粰鍑鴻鍒楃殑鍊兼椂錛岃鍒楀彲璧嬩簣鍊糳ef_value銆俤ef_value 蹇呴』涓轟竴涓父閲忥紱瀹冧笉鑳芥槸琛ㄨ揪寮忥紝涔熶笉鑳藉紩鐢ㄥ叾浠栧垪銆備笉鑳藉BLOB 鎴朤EXT 鍒楁寚瀹氱己鐪佸箋?nbsp;
濡傛灉鎯崇粰鍑哄涓垪鐨勪笓鐢ㄥ睘鎬э紝鍙寜浠繪剰欏哄簭鎸囧畾瀹冧滑錛屽彧瑕佸畠浠窡鍦ㄥ垪綾誨瀷涔嬪悗銆侀氱敤灞炴т箣鍓嶅嵆鍙傜被浼煎湴錛屽鏋滈渶瑕佺粰鍑哄涓氱敤灞炴э紝涔熷彲鎸変換鎰忛『搴忕粰鍑哄畠浠紝鍙灝嗗畠浠斁鍦ㄥ垪綾誨瀷鍜屽彲鑳界粰鍑虹殑鍒椾笓鐢ㄥ睘鎬т箣鍚庡嵆鍙?nbsp;
綾誨瀷
璇存槑
TINYINT 闈炲父灝忕殑鏁存暟 SMALLINT 杈冨皬鏁存暟 MEDIUMINT 涓瓑澶у皬鏁存暟 INT 鏍囧噯鏁存暟 BIGINT 杈冨ぇ鏁存暟 FLOAT 鍗曠簿搴︽誕鐐規暟 DOUBLE 鍙岀簿搴︽誕鐐規暟 DECIMAL 涓涓覆鐨勬誕鐐規暟
琛?錛氭暟鍊煎垪綾誨瀷
姣忕鏁板肩被鍨嬬殑鍚嶇О鍜屽彇鍊艱寖鍥村琛?鎵紺恒?br>
綾誨瀷璇存槑
鍙栧艱寖鍥?/strong>
TINYINT[(M)] 鏈夌鍙峰鹼細-128 鍒?27錛? 27 鍒?7 - 1錛?
琛?錛氭暟鍊煎垪綾誨瀷鐨勫彇鍊艱寖鍥?/p>
鍚勭綾誨瀷鍊兼墍闇鐨勫瓨鍌ㄩ噺濡傝〃3鎵紺恒?br>
綾誨瀷璇存槑
瀛樺偍闇姹?/strong>
TINYINT[(M)] 1瀛楄妭 SMALLINT[(M)] 2瀛楄妭 MEDIUMINT[(M)] 3瀛楄妭 INT[(M)] 4瀛楄妭 BIGINT[(M)] 8瀛楄妭 FLOAT[(M, D)] 4瀛楄妭 DOUBLE[(M, D)] 8瀛楄妭 DECIMAL (M, D) M瀛楄妭錛圡ySQL < 3.23錛夛紝M+2瀛楄妭錛圡ySQL > 3.23 錛?
琛?錛氭暟鍊煎垪綾誨瀷鐨勫瓨鍌ㄩ渶姹?/p> [NextPage]
MySQL鎻愪緵浜嗕簲縐嶆暣鍨嬶細 TINYINT銆丼MALLINT銆丮EDIUMINT銆両NT鍜孊IGINT銆侷NT涓篒NTEGER鐨勭緝鍐欍傝繖浜涚被鍨嬪湪鍙〃紺虹殑鍙栧艱寖鍥翠笂鏄笉鍚岀殑銆傛暣鏁板垪鍙畾涔変負UNSIGNED浠庤岀鐢ㄨ礋鍊鹼紱榪欎嬌鍒楃殑鍙栧艱寖鍥翠負0浠ヤ笂銆傚悇縐嶇被鍨嬬殑瀛樺偍閲忛渶姹備篃鏄笉鍚岀殑銆傚彇鍊艱寖鍥磋緝澶х殑綾誨瀷鎵闇鐨勫瓨鍌ㄩ噺杈冨ぇ銆?
MySQL 鎻愪緵涓夌嫻偣綾誨瀷錛?FLOAT銆丏OUBLE鍜孌ECIMAL銆備笌鏁村瀷涓嶅悓錛屾誕鐐圭被鍨嬩笉鑳芥槸UNSIGNED鐨勶紝鍏跺彇鍊艱寖鍥翠篃涓庢暣鍨嬩笉鍚岋紝榪欑涓嶅悓涓嶄粎鍦ㄤ簬榪欎簺綾誨瀷鏈夋渶澶у鹼紝鑰屼笖榪樻湁鏈灝忛潪闆跺箋傛渶灝忓兼彁渚涗簡鐩稿簲綾誨瀷綺懼害鐨勪竴縐嶅害閲忥紝榪欏浜庤褰曠瀛︽暟鎹潵璇存槸闈炲父閲嶈鐨勶紙褰撶劧錛屼篃鏈夎礋鐨勬渶澶у拰鏈灝忓鹼級銆?nbsp;
鍦ㄩ夋嫨浜嗘煇縐嶆暟鍊肩被鍨嬫椂錛屽簲璇ヨ冭檻鎵瑕佽〃紺虹殑鍊肩殑鑼冨洿錛屽彧闇閫夋嫨鑳借鐩栬鍙栧肩殑鑼冨洿鐨勬渶灝忕被鍨嬪嵆鍙傞夋嫨杈冨ぇ綾誨瀷浼氬絀洪棿閫犳垚嫻垂錛屼嬌琛ㄤ笉蹇呰鍦板澶э紝澶勭悊璧鋒潵娌℃湁閫夋嫨杈冨皬綾誨瀷閭f牱鏈夋晥銆傚浜庢暣鍨嬪鹼紝濡傛灉鏁版嵁鍙栧艱寖鍥磋緝灝忥紝濡備漢鍛樺勾榫勬垨鍏勫紵濮愬鏁幫紝鍒橳INYINT鏈鍚堥傘侻EDIUMINT鑳藉琛ㄧず鏁扮櫨涓囩殑鍊煎茍涓斿彲鐢ㄤ簬鏇村綾誨瀷鐨勫鹼紝浣嗗瓨鍌ㄤ唬浠瘋緝澶с侭IGINT鍦ㄥ叏閮ㄦ暣鍨嬩腑鍙栧艱寖鍥存渶澶э紝鑰屼笖闇瑕佺殑瀛樺偍絀洪棿鏄〃紺鴻寖鍥存澶х殑鏁村瀷INT綾誨瀷鐨勪袱鍊嶏紝鍥犳鍙湪紜疄闇瑕佹椂鎵嶇敤銆傚浜庢誕鐐瑰鹼紝DOUBLE鍗犵敤FLOAT鐨勪袱鍊嶇┖闂淬傞櫎闈炵壒鍒渶瑕侀珮綺懼害鎴栬寖鍥存瀬澶х殑鍊鹼紝涓鑸簲浣跨敤鍙敤涓鍗婂瓨鍌ㄤ唬浠風殑FLOAT鍨嬫潵琛ㄧず鏁版嵁銆?nbsp;
鍦ㄥ畾涔夋暣鍨嬪垪鏃訛紝鍙互鎸囧畾鍙夌殑鏄劇ず灝哄M銆傚鏋滆繖鏍鳳紝M搴旇鏄竴涓? 鍒?55鐨勬暣鏁般傚畠琛ㄧず鐢ㄦ潵鏄劇ず鍒椾腑鍊肩殑瀛楃鏁般備緥濡傦紝MEDIUMINT(4)鎸囧畾浜嗕竴涓叿鏈?涓瓧絎︽樉紺哄搴︾殑MEDIUMINT鍒椼傚鏋滃畾涔変簡涓涓病鏈夋槑紜搴︾殑鏁存暟鍒楋紝灝嗕細鑷姩鍒嗛厤緇欏畠涓涓己鐪佺殑瀹藉害銆傜己鐪佸間負姣忕綾誨瀷鐨?#8220;鏈闀?#8221;鍊肩殑闀垮害銆傚鏋滄煇涓壒瀹氬肩殑鍙墦鍗拌〃紺洪渶瑕佷笉姝涓瓧絎︼紝鍒欐樉紺哄畬鍏ㄧ殑鍊鹼紱涓嶄細灝嗗兼埅鏂互閫傚悎M涓瓧絎︺?nbsp;
瀵規瘡縐嶆誕鐐圭被鍨嬶紝鍙寚瀹氫竴涓渶澶х殑鏄劇ず灝哄M 鍜屽皬鏁頒綅鏁癉銆侻 鐨勫煎簲璇ュ彇1 鍒?55銆侱鐨勫煎彲涓? 鍒? 0錛屼絾鏄笉搴斿ぇ浜嶮 - 2錛堝鏋滅啛鎮塐DBC 鏈錛屽氨浼氱煡閬揗 鍜孌 瀵瑰簲浜嶰DBC 姒傚康鐨?#8220;綺懼害”鍜?#8220;灝忔暟鐐逛綅鏁?#8221;錛夈侻鍜孌瀵笷LOAT鍜孌OUBLE 閮芥槸鍙夌殑錛屼絾瀵逛簬DECIMAL鏄繀欏葷殑銆傚湪閫夐」M 鍜孌鏃訛紝濡傛灉鐪佺暐浜嗗畠浠紝鍒欎嬌鐢ㄧ己鐪佸箋?
2.2瀛楃涓插垪綾誨瀷
MySQL鎻愪緵浜嗗嚑縐嶅瓨鏀懼瓧絎︽暟鎹殑涓茬被鍨嬶紝鍏剁被鍨嬪涓嬶細
綾誨瀷鍚?/strong>
璇存槑
CHAR 瀹氶暱瀛楃涓?VARCHAR 鍙彉闀垮瓧絎︿覆 TINYBLOB 闈炲父灝忕殑BLOB錛堜簩榪涘埗澶у璞★級 BLOB 灝廈LOB MEDIUMBLOB 涓瓑鐨凚LOB LONGBLOB 澶LOB TINYTEXT 闈炲父灝忕殑鏂囨湰涓?TEXT 灝忔枃鏈覆 MEDIUMTEXT 涓瓑鏂囨湰涓?LONGTEXT 澶ф枃鏈覆 ENUM 鏋氫婦錛涘垪鍙祴浜堟煇涓灇涓炬垚鍛?SET 闆嗗悎錛涘垪鍙祴浜堝涓泦鍚堟垚鍛?
琛?錛氬瓧絎︿覆鍒楃被鍨?/p>
涓嬭〃緇欏嚭浜哅ySQL 瀹氫箟涓插煎垪鐨勭被鍨嬶紝浠ュ強姣忕綾誨瀷鐨勬渶澶у昂瀵稿拰瀛樺偍闇姹傘傚浜庡彲鍙橀暱鐨勫垪綾誨瀷錛屽悇琛岀殑鍊兼墍鍗犵殑瀛樺偍閲忔槸涓嶅悓鐨勶紝榪欏彇鍐充簬瀹為檯瀛樻斁鍦ㄥ垪涓殑鍊肩殑闀垮害銆傝繖涓暱搴﹀湪琛ㄤ腑鐢↙ 琛ㄧず銆?br>
綾誨瀷璇存槑
鏈澶у昂瀵?/strong>
瀛樺偍闇姹?/strong>
CHAR( M) M 瀛楄妭 M 瀛楄妭 VARCHAR(M) M 瀛楄妭 L + 1瀛楄妭 TINYBLOB, TINYTEXT 28- 1瀛楄妭 L + 1瀛楄妭 BLOB, TEXT 216 - 1 瀛楄妭 L + 2瀛楄妭 MEDIUMBLOB, MEDIUMTEXT 224- 1瀛楄妭 L + 3瀛楄妭 LONGBLOB, LONGTEXT 232- 1瀛楄妭 L + 4瀛楄妭 ENUM(“value1”, “value2”, ...) 65535 涓垚鍛?1 鎴?瀛楄妭 SET (“value1”, “value2”, ...) 64涓垚鍛?1銆?銆?銆? 鎴?瀛楄妭
琛?錛氫覆鍒楃被鍨嬫渶澶у昂瀵稿強瀛樺偍闇姹?/p>
L 浠ュ鎵闇鐨勯澶栧瓧鑺備負瀛樻斁璇ュ肩殑闀垮害鎵闇鐨勫瓧鑺傛暟銆侻ySQL 閫氳繃瀛樺偍鍊肩殑鍐呭鍙婂叾闀垮害鏉ュ鐞嗗彲鍙橀暱搴︾殑鍊箋傝繖浜涢澶栫殑瀛楄妭鏄棤絎﹀彿鏁存暟銆傝娉ㄦ剰錛屽彲鍙橀暱綾誨瀷鐨勬渶澶ч暱搴︺佹綾誨瀷鎵闇鐨勯澶栧瓧鑺傛暟浠ュ強鍗犵敤鐩稿悓瀛楄妭鏁扮殑鏃犵鍙鋒暣鏁頒箣闂寸殑瀵瑰簲鍏崇郴銆備緥濡傦紝MEDIUMBLOB 鍊煎彲鑳芥渶澶?24 - 1瀛楄妭闀垮茍闇瑕? 涓瓧鑺傝褰曞叾緇撴灉銆? 涓瓧鑺傜殑鏁存暟綾誨瀷MEDIUMINT 鐨勬渶澶ф棤絎﹀彿鍊間負224 - 1銆傝繖騫墮潪鍋剁劧銆?/p>
[NextPage] 2.3鏃ユ湡鏃墮棿鍒楃被鍨?
MySQL 鎻愪緵浜嗗嚑縐嶆椂闂村肩殑鍒楃被鍨嬶紝瀹冧滑鍒嗗埆鏄細 DATE銆丏ATETIME銆乀IME銆乀IMESTAMP鍜孻EAR銆備笅琛ㄧ粰鍑轟簡MySQL 涓哄畾涔夊瓨鍌ㄦ棩鏈熷拰鏃墮棿鍊兼墍鎻愪緵鐨勮繖浜涚被鍨嬶紝騫剁粰鍑轟簡姣忕綾誨瀷鐨勫悎娉曞彇鍊艱寖鍥淬?br>
綾誨瀷鍚?/strong>
璇存槑
DATE “YYYY-MM-DD”鏍煎紡琛ㄧず鐨勬棩鏈熷?TIME “hh:mm:ss”鏍煎紡琛ㄧず鐨勬椂闂村?DATETIME “YYYY-MM-DD hh:mm:ss”鏍煎紡 TIMESTAMP “YYYYMMDDhhmmss”鏍煎紡琛ㄧず鐨勬椂闂存埑鍊?YEAR “YYYY”鏍煎紡鐨勫勾浠藉?
琛?錛氭棩鏈熸椂闂村垪綾誨瀷
綾誨瀷鍚?/strong>
鍙栧艱寖鍥?/strong>
瀛樺偍闇姹?/strong>
DATE “1000-01-01”鍒?#8220;9999-12-31” 3瀛楄妭 TIME “-838:59:59”鍒?#8220;838:59:59” 3瀛楄妭 DATETIME “1000-01-01 00:00:00” 鍒?#8220;9999-12-31 23:59:59” 8瀛楄妭 TIMESTAMP 19700101000000 鍒?037 騫寸殑鏌愪釜鏃跺埢 4瀛楄妭 YEAR 1901 鍒?155 1瀛楄妭
琛?錛?鏃ュ墠鏃墮棿鍒楃被鍨嬬殑鍙栧艱寖鍥村拰瀛樺偍闇姹?/p>
涓嬮潰涓句釜渚嬪瓙錛?br>
CREATE TABLE student ( Name varchar(20) NOT NULL錛? Chinese TINYINT(3)錛? Maths TINYINT(3)錛? English TINYINT(3)錛? Birthday DATE )
榪欎釜渚嬪瓙鍒涘緩涓涓猻tudent琛紝榪欎釜琛ㄤ腑鏈塶ame瀛楁錛屽瓧絎︾被鍨嬪垪錛屼笉鍏佽NULL錛堢┖鍊鹼級銆傛湁Chinese銆丮aths鍜孍nglish涓変釜鏁存暟綾誨瀷鍒椼傝繕鏈変釜Birthday鏃ユ湡綾誨瀷鍒椼?br>
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