MySql数据类型教程示例详解 |
1.绠瑕佹杩?/h2>涓轰粈涔堣寮閫歁ySQL杩欎釜瀛︿範鏉垮潡鍛紵鍥犱负杩欐槸涓鍚嶆暟鎹垎鏋愬笀蹇呰鐨勪竴椤规妧鑳姐傚垎鏋愭暟鎹粈涔堟渶閲嶈锛熷綋鐒舵槸鏁版嵁锛屾棦鐒跺姝わ紒鍦ㄦ暟鎹憟鐜扮垎鍙戝紡澧為暱鐨勫勾浠o紝鎬庝箞鑳藉涓嶅瀛︽暟鎹簱鍛紵鍏跺疄杩欎篃鏄緢澶氳鑰呮湅鍙嬪笇鏈涚湅鍒扮殑锛屼篃鏄粬浠缓璁垜鍐欑殑銆?/p> 闅捐呬笉浼氾紝浼氳呬笉闅撅紒鍏跺疄缃戜笂寰堝MySQL鐨勬荤粨鏂囩珷锛屼笉鍙惁璁わ紝鐭ヨ瘑鐐瑰啓鐨勯兘寰堝叏锛屼絾鏄憿锛佽繖涓彧鏄細浣跨敤MySQL鏁版嵁搴撶殑鏈嬪弸鐨勪竴涓煡璇㈡墜鍐岋紝涓嶄細浣跨敤鐨勮繕鏄笉浼氫娇鐢ㄥ憖(骞舵病鏈夎缁嗙殑浠嬬粛)銆備簬鏄垜灏卞紑濮嬩簡鎴戣繖涓澘鍧楃殑鍐欎綔锛屽笇鏈涜兘澶熷府鍔╅偅浜涜浆琛岀殑锛岃瀛︿範MySQL鐨勬湅鍙嬩滑銆傚綋鐒惰繕瑕佽ˉ鍏呬竴鐐癸紝杩欎簺鏉垮潡骞朵笉鏄拡瀵归偅浜涙悶寮鍙戠殑銆佹兂褰揇BA鐨勬湅鍙嬶紝鑰屾槸閽堝閭d簺杞鏁版嵁鍒嗘瀽锛岀劧鍚庨渶瑕佸涔燤ySQL鏁版嵁搴撶殑閭d簺鏈嬪弸浠?/p> 鍓嶉潰鎴戜滑宸茬粡甯︾潃澶у鎬庝箞瀹夎浜哅ySQL鏁版嵁搴撲簡锛屾垜涔熺浉淇℃垜鍐欑殑杩欎釜瀹夎鏁欑▼搴旇鏄叏缃戞渶璇︾粏鐨勪竴涓暀绋嬶紝涓嶄俊浣犵湅銆?#8195; 銆奙ySQL瀹夎鏁欑▼銆?/a> 褰撶劧锛屽鏋滀綘姝ゆ椂姝e湪涓篗ySQL鐨勪簩娆″畨瑁?绗竴娆″畨瑁呭け璐?鎰熷埌鑻︽伡锛岄偅涔堣繖涓狹ySQL鐨勫嵏杞芥枃绔犲簲璇ュ浣犱細鏈夊緢澶т綔鐢ㄣ?#8195; 銆奙ySQL鍗歌浇鏁欑▼銆?/a> 铏界劧鎴戜滑涓嶅綋DBA锛屼絾鏄傚綋浜嗚В涓浜汳ySQL澧炲垹鏀规煡浠ュ鐨勭煡璇嗭紝涔熸槸鏈夊繀瑕佺殑锛屾瘮濡傝寤鸿〃璇彞涓轰粈涔堝姞涓婅繖涓猚harset=utf8锛熸垜浠粠杈撳叆SQL璇彞鍒版湇鍔″櫒缁欐垜浠繑鍥炴暟鎹紝绌剁珶缁忓巻浜嗕竴涓庝箞鏍风殑鍘嗙▼锛熶綘灏卞彲浠ュ疄褰撶湅鐪嬩笅闈㈣繖绡囨枃绔犮?/p> 銆婁綘鐪熺殑鎼炴槑鐧戒簡charset=utf8缂栫爜闂鍚楋紵銆?/a> 2. MySQL鏁版嵁绫诲瀷璇﹁В瀛﹁繃缂栫▼璇█鐨勪汉閮界煡閬擄紝鎬庝箞瀛︿範涓闂ㄧ紪绋嬭瑷鍛紵棣栧厛瑕佷粠鏁版嵁绫诲瀷寮濮嬪璧枫傝櫧鐒跺簱鏄埆浜哄垱寤虹殑锛岃〃鏄埆浜鸿璁$殑锛岃繖浜涘ソ鍍忛兘涓庝綘鏃犲叧锛屼絾鏄帉鎻¤繖鏍蜂竴涓煡璇嗙偣锛屽浣犳洿濂界殑鐞嗚В鍜屽涔燤ySQL锛岃偗瀹氭槸浼氭湁甯姪鐨勩?/p> 1锛?瀛楃涓茬被鍨?/h3>鈶?char(m)锛氬畾闀跨殑瀛楃涓层?/p> 鈶?varchar(m)锛氫笉瀹氶暱鐨勫瓧绗︿覆銆?/p> 涓婅堪鐭ヨ瘑锛屽彲浠ュ弬鑰冧笅鍥剧悊瑙c?/p> 鈶?char鍜寁archar瀛樺偍鐨勭┖闂村埄鐢ㄧ巼姣旇緝銆?/p> 浠庝笂琛ㄥ彲浠ョ湅鍑猴細 鈶?tinytext銆乼ext銆乴ongtext 娉ㄦ剰锛氬彧瑕佸瓨鏀剧殑鏄瓧绗︿覆绫诲瀷锛岄兘瑕佹敞鎰忕紪鐮侀棶棰橈紝涓鑸娇鐢ㄧ殑鏄痷tf8缂栫爜銆?/p> 2锛?鏁存暟绫诲瀷绗﹀彿浣嶄笌鏃犵鍙蜂綅璇﹁В缃戝潃锛?a target="_blank" href="https://www.jb51.net/article/178768.htm">https://www.jb51.net/article/178768.htm 鈶?鏁村瀷鏁版嵁绫诲瀷澹版槑鏃剁殑鍙傛暟闂 鈶?unsigned鍙傛暟銆?/p> -- 鍒涘缓琛? create table person( pname varchar(20), page tinyint unsigned, psex bit(1) ) charset=utf8; -- 鎻掑叆涓ゆ潯璁板綍 insert into person (pname,page,psex) values ("寮犱笁",18,0), ("鏉庡洓",22,0); 瑙傚療涓嬪浘锛?/p> 浠庝笂鍥惧彲浠ョ湅鍑猴細 鈶?zerofill鍙傛暟蹇呴』鍜孧鍙傛暟閰嶅悎浣跨敤"鎵嶆湁鎰忎箟"銆?/p> -- 瀵瑰鍙峰瓧娈佃繘琛屼竴涓鏄庯細 -- 1锛氬鍙蜂笉鑳戒负璐燂紱 -- 2锛氬鍙蜂竴鑸綅鏁扮浉鍚岋紝鍗充娇涓嶅悓锛屼篃浼氱敤0濉厖銆? -- eg锛?0001锛?0013锛?0128锛?1280銆? -- 鍒涘缓琛? create table student( sid smallint(5) zerofill not null default 0, sname varchar(20), sage tinyint unsigned, ssex bit(1) default 0 ) charset=utf8; -- 鎻掑叆涓ゆ潯璁板綍 insert into student(sname,sid) values ("寮犻",5),("鍚曞竷",1); 瑙傚療涓嬪浘锛?/p> 浠庝笂鍥惧彲浠ョ湅鍑猴細 3锛夋诞鐐规暟绫诲瀷涓句緥璇存槑锛?/p> -- swage浠h〃宸ヨ祫锛泂bonus浠h〃娲ヨ创锛屾触璐翠笉鑳芥槸璐熸暟銆? -- 鍒涘缓琛? create table salary( sname varchar(20), swage float(6,2), sbonus float(5,2) unsigned not null default 0 ) charset=utf8; -- 鎻掑叆涓ゆ潯璁板綍 insert into salary (sname,swage,sbonus) values ("绾檽宀?,9999.99,111.11), ("鍜岀弲",-9999.99,444.44); 瑙傚療涓嬪浘锛?/p> 浠庝笂鍥句腑鍙互鐪嬪嚭锛?/p> 鈶?float/double鍜宒ecimal绮惧害姣旇緝 -- 鍒涘缓琛? create table bank( id varchar(20), acc1 float(9,2), acc2 decimal(9,2) ) charset=utf8; -- 鎻掑叆涓ゆ潯璁板綍 insert into bank(id,acc1,acc2) values (1,1234567.45,1234567.45), (2,1234567.678,1234567.678); 瑙傚療涓嬭〃锛?/p> 浠庝笂琛ㄤ腑鍙互鐪嬪嚭锛?/p> 4锛夋棩鏈?鏃堕棿绫诲瀷鈶?浠涔堟槸鏃ユ湡绫诲瀷鍜屾椂闂寸被鍨嬶紵 1锛夋棩鏈熺被鍨嬶細鎸囩殑鏄勾銆佹湀銆佹棩锛岀被浼间簬2019-11-16(2019骞?1鏈?6鍙? 2锛夋椂闂寸被鍨嬶細鎸囩殑鏄椂銆佸垎銆佺锛岀被浼间簬10:45:30(10鐐?5鍒?0绉? 鈶?鏃ユ湡/鏃堕棿绫诲瀷 浠ヤ笂灏辨槸MySql鏁版嵁绫诲瀷鏁欑▼绀轰緥璇﹁В鐨勮缁嗗唴瀹癸紝鏇村鍏充簬MySql鏁版嵁绫诲瀷鐨勮祫鏂欒鍏虫敞鑴氭湰涔嬪鍏跺畠鐩稿叧鏂囩珷锛?/p> |