Oracle 部分函数使用说明

oracle有些函数可能我知道是什么作用，但是具体其实说不清楚，这里是我这几天看到的函数使用方法及说明，记录一下，以后看看

--1、replace（'str',oldVal,newVal）替换功能方法

replace('aaaaabbbbbccccddddd','a','')  --把字符串中的a替换为''

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select replace('bbbbbbcccccaaaa','c') from dual;  --把其中的c字符给剔除

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--2、GREATEST（2,3,'4') 比较两个值或者多个值中最大的哪一个值 对应数字也可以是字符串

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3、nvl(bonus,0)    意思是   如果  bonus  is  null  ，  那么返回 0，  否则返回   bonus
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4、instr(str1,str2) --如果str1在str2中没有找到 函数返回0,否自返回对应下标位置

SELECT instr('laotan','n') FROM dual; -- 返回 1 查找‘n’ 在字符‘laotan’ 中的下标位置

SELECT instr('laotan','an') FROM dual;  -- 返回 5   查找‘an’ 在字符‘laotan’ 中的下标位置

SELECT instr('hello laotan','a',1,2) FROM dual;  -- 返回 11 从第一个字符开始找，查询字符 ‘a’ 在字符串 ‘'hello laotan’第二次出现的下标位置

5、coalesce(name,'没有值') 如果没有值，那么返回后后面设定的参数

aaarticlea/png;base64,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" alt="" />

6、coalesce(bonus,0,1)  如果  bonus  is  null  ，  那么返回 0，  否则返回   bonus。
这里的最后一个参数  1
coalesce(bonus,null,0)  如果  bonus  is  null ， 那么第2个参数还是 null,  最后返回第3个参数 0

7、decode(name,‘apple’,0)   如果  name  = 'apple'  那么返回  0
否则的话 ,  就是返回  null  了。

--8、substr(1000.222,-3) 截取字符串函数 

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9、把对应的字符串中的 ‘l’ 字符全部找出来, 替换字符 translate()

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAqQAAABQCAIAAABAuPDYAAAGXElEQVR4nO3dS3LjNhAAUN3/KqmsckBlFRdNAI0GyNGn897CJUNgowGCalEzth9//f3PEwCo66HYA0Btij0AFKfYf4HH43F6wB+1t86Zo/KR257xsfbGa7xyb3zIOV3deN3+x8Yg4I0X0b3XYwEfXewf/3l3Igtuzzm4SD5tfTLJtDm/chbBWMf2W17Qu2O9rNjbG6s+c2+8fe6ZHDKF/N5if3Qx1LRPO/TSIX8i8t51cS727SLG3/40Lo26luLHvGDl3Zjz9FXmo9YnmcxqJbtXvJK3vJp325ciLy2RvXGXT9sb75r7Y2baLQ5+eioz1jTOqTH5yplf4WnAi1bDLvc/Fvt2HbsrGy/x7e69wK5HfuXor5zFLXEKvKC/ZqyNAzdC2RurPnBvvGz6Gy/smeXae0OQCRv3iTtnQq2md9Hbin3bknyjdDvF/nqfDC/oiv0fjWNv7MX8nGKfPzUbxTV+Q/Dz+Pi1DRWMEtey99aLvfiXiv3zsKZtuMy6LA3ffYvXvuPr7pu2T7sz2m7B6O2Ddqwg4WDdujlvz707kXisbkv3kNW5B3Gm+WzMou1//DrKuQ01Giuz2qu2Y2aWaC+IvfH8qr0x7dY9NRs5T1c+vyfjnvkTGjfG6XW/DU73dFMdVzXYP6vXxfP3HstE7k6w2/Lr2e5/0Ouu5miJ84NNO8fjjvpkjsokEKxmctB8znt9krNYSvXeONtnJ7MabYfj19GD62NdsR1z9UrOBLE3nl+4N5Kn5nqq+dfDU5+uIHg3bCbOsSUerpvtXp8g7Xi3dPdhEHbpwWryz1GxfzYnYDReN+mF4X+vV/fkdZf4dNb3kplu5efvFXiOF30aamNee7NI5vyH4nQ7Z+YVXzajsUZhl/ZGcn32bMecLtF2EHsjOPwD98a0W3eyF3fLo3nN756sTMxYd/S2Meg8ymdpTybnEh97GrH9msyzm3lyxaL8k/9Br3thj9JatXf5xYdn8tmIHKQajJ7JcLplR6ZjZZK/K87eWEujn/rEu3FvppmEk248cCOUvXFx9Lfvjfzlf33D5Fd+evjeXu3qdnv2TvE0q9Vn487THZ7Mc+lqurLI52LfLvGppXsy9rb7dLjRWR+1dINnEgj6t/M99m9nMc350axknHMwhdWx4phxnNHc4/UM1jm5YkHOQQ7JGQUr1h1ryWis/OFXcsjPdLrOT3ujaWzHWjIaay94sGgX82kXsJvecVUzx3YTyzcecx49m+kQx+9Gaxc5GPS4OJlUT8cGLcnzdR4l+Ut1lrYO97p35e+K9sr98N6995bRRy+sLx70vXE+bawXj/72l9zVYj9qzGzmpXcA18t8EP973VPsgVd6S7GHo9NdbHt3e+zZvdd8jvdt5p1EcKfbDbh6U/q/uqYUewAoTrEHgOIUewAoTrEHgOIUewAoTrEHgOIUewAoTrEHgOIUewAoTrEHgOIUewAoTrEHgOIUewAoTrEHgOIWiv30Twhn+sd/5Dg5Vr7PvaEA4BvdVuyfuUJ+b7FP/pHjTKhpHwD4Ur+KfVs4HzPTbufxxsU+OdY0zqmxfdDtqd4DUNX5zj5zR55/Nvm+YWmsNmzcJ+6cCQUAX22n2OfL80Zxjd8Q/Dw+3Y7n7/u7T03v/gHge6WKfVAvg6OmPbvPZhI4Ncbpdb89DdR+AtEOBwBfal7s438vP/ZZ/Yg+KMNxnPZefzRcN9u9PgDwpSbFvv20PK6sw2FmRgmcGoPOo3wegw8Aun0AoJ6o2I/KZFwaMwU4Pnx6Z/88VP3T25FMVqvPAsBX6//o3anETot9+wHAqHP+Jn7aeMx59GymQxwfAL5d6pfqrBb7UePowLglaLxe5oP4AFDDQrEffbp+Kuejz96n/6Y+6nb6jGH0wX6bw3Re09wAoAB/CAcAilPsAaA4xR4AilPsAaA4xR4AilPsAaC4yS/V+T9741kBgBu5sweA4hR7AChOsQeA4hR7AChOsQeA4hR7AChOsQeA4hR7ACiu/0t1LrYAAJ+jc2fflu29FgDgEyj2AFCcYg8AxSn2AFCcYg8AxSn2AFCcYg8AxfV/zv7n5+b3WgCAz+E36AFAcYo9ABSn2ANAcYo9ABSn2ANAcYo9ABSn2ANAcYo9ABSn2ANAcYo9ABSn2ANAcYo9ABSn2ANAcYo9ABSn2ANAcf8CN+/YxyiaJOcAAAAASUVORK5CYII=" alt="" />

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAxQAAAB+CAIAAAAyZsBnAAAJMElEQVR4nO3dS7LiOhIAUDZw97+Ijh71zmoDvEG9cPvqk840xhg4Z1BhREqWjZUkn+Le/vPf/90BAMi5KZ4AAPIUTwAABYonAIACxRMAQIHiCQCgQPEEAFCgeAIAKFA8AQAUKJ7ez+12G27nA4bts8gds9oX8KYue1yZiT0v5tmn5ZBV0Hf565BZ7QsA3sKFiqfHM9fHu630N9dhfZfhaMPtfl+NYHrx5MODO8Ph19gVDmrmSYXR8ARuXmAHOnAVbF7YV1gFx16xux2+duCttcVTnx3im0vjYROyOLfcwqJn3dhv3MPng+aBzuwx+exSevp5tm+4XDMT2x2TXP5PPTkProKgY2Yvp62CYPIvcZFpwMv9Kp767DDMF5l8un9Cu8a52pJ+xnyCBL1k4WFefvyUxk8bpe6bHfMBuz21sDjNC/ee3/Xhkzx2FZQuwg9bBftcbT7wKtPiqW/ZfDI+ZF0pnjIj9/8O9z58FonbZzHD+OHe+zn0YZnz8+xzeE7M87xw7/ldP2mSh6yC/q4+7INXwT5Xmw+8yvhju/XNfjtYP/Fdfd7JpKEg5QUjzyYQjBO0NNvNxmyQ0nwyvTYfmubmOmXHfTMx8b6CqTY7ik/LErw+G/3GOmzYJW4c7m6z1+axD2NmgwdH0W9kZpixo8tskOTjWJpP5rhmD+Xs0VlOYxBz1L6C7s1kkmdvfTb6jXXYsMvm4LNes3GGR9T0ireDlnjCcCnjL4w3eSdonHXM3BXvZRaT6RXs/YSNB+cTd7mN9HtfN84C+u6zQ4gfoJl+/qX8mM+2yQclGLlvPyTmtddYL3+xHTVOHPDaVVCd/1usguBgq73OvObh7Uz/t12TpO6JKz6Tifrs1jf2XdYxw71kFuHmOEFLNRHsmM+9Oz+zXkHL8Bj7TNpvD2Nm4vkEs4qHio909rgPH9P4rA7PYf9YDAPiR3k2n7jLjo3hUBmZM58ZJDmHTEB/VncMO7ze1net/216BVfm/Mq9yioIDjMYudn7sFfmqguCh+dw1gJvJ/uF8ebS77vkl0HcpZoskntPLvJDNvbNJ9k3k3yXx24W2Tf22TaznZztLOzwKyF5Vmcj7zjMeC2ceY1lFmBmtR41Tmao166CdUxmYs9eBbO+cXAz1dlyzgzb9CpddU1M0CWeGLyLtnga5pd1yzATJRNuPHiQ4IYtw8FLE5iNk2kZnoT+LOXnMzz2Ya9Sy/ABmgX07fnt2DByfbqG9/YnZxYzeyyCk9wcSNMYxATHNRunj8m0BMfVz6c/OUPDww+OKB5kM6w6n83pzUaOW5bBhwFB336QeDs2jAy6z07OMGw92vB4Z4PPevUX2PDRmU1ptq+gJZgtXE32RzIzuZIT3Eb6mGbjhO0d086k+Ou7wvyPmsOBx/LU03LsKghGO20VXNDuie3reNnzAEMX+oVxMoInieXmrCjpnxKa54nhc0YzchyTn3Z1BFg8vgri6ico679kFewr7K5cC8KxFE8AAAWKJwCAAsUTAECB4gkAoEDxBABQoHgCAChQPAEAFCieAAAKFE8AAAWKJwCAAsUTAECB4gkAoEDxBABQoHgCACgYF0+32224nQ8Yts8ikza7Pzg+wDs6JGP3Xf46ZFb7AuCy2uLpttLfXIf1XQajhyv2NjedbrjYLEXgqxyYsTeTsIwNi0ffeeo37uEaW6+02V76ZZ9ZsaUlDfAxHszYQcfMXmRsvtCv4imueG7dK5tgHab2nV6Kpe6bHQE+wLEZezNhytiwGLzztCy55t8+5j5/pzdon8UM44d77+fQh1mHwDc4JGP3dw1LLhkb/hp852lz+z5ZBnHfTEy8r3bqkwTRL2aAj3RUxu5vPr6voHszGRmbt9N+bHeffxTdrJZ+EfYBffd9xVPm5c7dIgS+yYEZu7852128PZuPjM2HmX5sN2tplkG+MNossGZrbLa6dgwF8GEOydjrxlkWlbFhMS6eNi/o6jK75wqsfru/OZztLMxSBD7bIRn7Pqmo1i0yNizK7zz1LcOVMAuoFk/5tWQpAl/o2Iz9YPEkY/MlHnrn6f5YMXT4UszMHOCTHJuxg9FkbFjseedpucQzS7RZe8N12Iwcx0yPxOsY4Ps8nrHj6mfW9y5j88X8YWAAgALFEwBAgeIJAKBA8QQAUKB4AgAoUDwBABS0f9sOgAsapG/gVbzzBACQp3gCAChQPAEAFCieAAAKFE8AAAWKJwCAAsUTAECB4gkAoGCjePr7W1CnzQaA3fqMfVQO91wAa9vvPFkwAO+iz9hH5XDPBbBQPAF8DsUTnEDxBPA5FE9wgrZ4Wv/Zu6alD5t1GbYPwzLjADCUydizgGrGTo4D32D8zlOz8I7dKI0MQEzGhpMNiqf+5Ujf3r8EmcU0Q81e6wTjADCzmbGTRc9mxlY8wWJP8bTvVcu+AQEIyNhwvo3vPPXbfdhmzHDk/DgADGUy9iwV34sZOzkOfINn/cJ4UyE9YxcAHELGhpIn/nmW/n0mAK5JxoY8f9sOAKBA8QQAUPCrePK2LcC76DP2vgQu7UPV9k8VAHBZTcbel8ClfSg5rHiy9gDOt694OqTkgq+leAJ4Y4onOF+qeOo/ER9+0B58+j4MAOBBw+RczdizmzI2DB3z51l29wLgETI2nK/wzlNpKSZ7AfAIxROczztPAG9MxobzjX/nKfkB+a+Bwl7re32ODvC4YcbuU/E9kbGDmzI29PzCOABAgeIJAKBA8QQAUKB4AgAoUDwBABQongAAChRPAAAFiicAgALFEwBAgeIJAKBA8QQAUKB4AgAoUDwBABQongAAChRPAAAFiicAgIJfxdOfp/n5+fn5+Xne+AAA51A8AQAUtMXTbeXfiPDm0hjvRvEEAHyGX8XTugb6u923/JmUSnH9pHgCAD7DtHj69+508RS0/1E8AQCfYvyx3f/vrhRPwV2KJwDgM4y/MD6skxRPAADT/223fOdpeS/Kx3YAANkvjDf/4a4J++ML4wDAd2iLp/6XCGY/VTB8U2pG8QQAfIbsj2T2v+1UongCAD6DXxgHAChQPAEAFPwqngAAiCmeAAAKFE8AAAWKJwCAAsUTAECB4gkAoEDxBABQoHgCAChQPAEAFCieAAAKFE8AAAWKJwCAAsUTAEDBP+qOFJWM5vOmAAAAAElFTkSuQmCC" alt="" />

 10、拿到字符长度 length(str)
select length(translate('lao,tan,hello,world', 'l' || 'lao,tan,hello,world', 'l')) as cnt from dual;

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAqAAAABMCAIAAAA9R5JCAAAE8ElEQVR4nO3dTXKdOhAG0Lv/raQyegu8GaQehZFoJPHfOWfgsmXoFkKXz04c5/Pr939fACCXj4AHgHwEPAAkJOABICEBf6nP53P3FLpNc37j5N9obJ1bzmqvXB4Zn2tvXOPKvdG7B3igRwf853+vq7z2qcPbVbsf2GhealH2vDUc0zKZcs5XXkXQaz5+yEO82uuygLc3ej1zb7w048+7a12Vn/AqWAb8Z2YxUv1wGjxxiqcVP28TXNnu1EabT5ZHveAbJ3PvYyteyUOe4NXxrspdS2RvHOVpe+ONAb/zi6H2+icdf6wfAV/e8uomaPxa77ApPuBPLLvq3P618FHXfuManlrkyQ/xa3oNnDhQyt7o9cC98aiMv/KJdFT9hwZ8OXLXN3MCfud8bj+mhYe4gD+1jr0xVlPA76z/oID/Fn/H0BXw8aeqB0/WJlCtWT1mPlit3DLbliKL8fKwtbM2i5SXtjmftcHguuJS8fqU2u9OXCSez9q9WKuzOZ+BqyiPn79dm3NZaq1Xy2r3Gq7ZskRjReyN76v2xsBOqN6srhsU3PTNxS/rrE2pa3rVGcaVp5GyTtzoQPUfsptffDy4dmJT7/UrDzZ9eUzLWS0TaKk8NsPqfMqz9syn67qG5zzQq2XbHFVneG+0rEZ5wPzt2jv7e+0xXPOQp5K9kWBv9O6E3pu7edb+J1K8qtX7NTbD4TmfZ/Wn6KcLnhaocWf3tf+5+p+ZtbLlMdW+w1uhWrmcZFynetZm9+oM98+nrFPtvnlM1Wavxtf5IXWqB7dcV8sdjKe31j2YZHuvYcM1N5douIi9EZz+wL0xsBOqlz9wi8tPDTyRNiuXb+Oy8a1s2VFXav0hu+rL6XvQFhzb9PHpZ2yF3hnG9fd0j191LfPZ7B6Pt/c6ag27FqGrV1f3xTHXPMSHX1wHnjhQyt7Y2f32vTGwDRqfUZtnXfZUL98Oz3B4zudZBvykHCyPmcbHrmGzXdmoOqVppFp8s/Vm90X9sbO+tZ1XPSuYZ1m5Oh7MsPEq1ubctYaLXnHNuM7atcfrGaxz44oFcw7m0HhFwYpVe3VZ69V++p45tF/p5jp/7Y1isOzVZa1XS/GWdsEybp61qBCMd7WOe31XbllcfHNkbZ0Hbtmw1l90s3l7/hE779Mb1/DYOR9V7dIXyb1fg9/RfezJfnjTe+s8rdfF3W/ZA/+CJwY8k5avRuHVPNwhAQEPAAkJeABISMADQEICHgASEvAAkJCAB4CEBDwAJCTgASAhAQ8ACQl4AEhIwANAQgIeABIS8ACQkIAHgIQEPAAkJOABIKFnBfxnZvpwMb44BgAoPSjg54E9vb94p3wLAJQeGvDzwTLORTsAxAQ8ACT0goD/zmI+OBIAmAh4AEjooQG/9kN25fsAQOlBAf+d/XO48sPqIABQ9ayABwAOIeABICEBDwAJCXgASEjAA0BCAh4AEhLwAJCQgAeAhH4E/Np/u/5kN64dADyW7+ABICEBDwAJCXgASEjAA0BCAh4AEhLwAJCQgAeAhAQ8ACQk4AEgobcGvN9hBwCBVwa8X1ILADEBDwAJvS/g/0a7gAeAwMsCfsp1AQ8AgfcFvP8rFgA2vSzgJ9IdAAKvDHjfwQNA7JUBDwDEBDwAJCTgASAhAQ8ACQl4AEhIwANAQgIeABIS8ACQkIAHgIQEPAAk9AeIMJ8n4GURBgAAAABJRU5ErkJggg==" alt="" />

11,wmsys.wm_concat(列名)  把多行合并成一行
aaarticlea/png;base64,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" alt="" />   
合并后查询结果如下
aaarticlea/png;base64,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" alt="" />

未完待续。。。大家遇到的其他常用/好用 函数欢迎留言分享。。。