在数据库中,我们有时会用到小数,怎样在数据库中转化小数呢,下面是一些常用的方法。

1、使用Round(字段名/数字,小数保留位数)方法,如下所示:

select Round(3.333,2)

结果如下:

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAATMAAACTCAIAAABtUWlTAAAPBklEQVR4nO2dzW/bRhqH5y8p0GuBHgqhQKKrT7n4lAJFeijWadiLAR+LIj4YcdCFWx9sILZDpFn4EOfitRt7AQcBsrXWbXexFpM0SWt3o6hN6nzKX/qy48gyZg8jUkNyhiIp0aJGvwcvBGo4Gg5FPnqHNEkTSumFv44dcExPT+fzefYaFNo6luaGyBAXUyuUUrq5khyylWtr/IeIGZRSOjQ05LkASogZGtUIJcnanLEkN4vQJSoo18xSjdgqW/UzY1xlrf4RR32rHY/litlcSQ7NsTpjU9b3sKbZvx9i1pHhWCjRGqwXzdCkqP+y9XV81Q1WqtYlUiM55qO6mhAaVzMDr8nQUDAzO5/MylRNv7m1xrVBR6GOmebqdJGZQGHUMbMLcyZQGHXMNFcHZgIVUMdM5EygEuqYaa4OzAQqoI6ZyJlAJdQx01wdmAlUQB0zkTOBSsTaTHYZUHJl01Fe/ws7uzDItjowE6hAfM3MrEyRuTW6Nucwc2muLmRmZcqai5wJVCK+ZtZwmcnDm2muDswEKtChZprXbXOjWeRMoBIdamaNpbkh5EygJJ1tJqVrmpk2kTOBSnSemdy9iHRpznEDFMwEihBfM8V3TlNquzkYx5lAUeJrZtjVgZlABdQxEzkTqIQ6ZpqrAzOBCqhjJnImUAl1zDRXB2YCFVDHzEA5c/lOBtGFcVw7YwtQx0xzdWAmQhrHtR+2AHXMRM5ENIzj2hlbgDpmmqsDMxHSOK79sAXE2kzZndOU0tqVQNyleVHnzNnx/p7e0z29p8+M//v4dqaZYbbQWpy7EuXiFgYki7h4rv/iLcFX4bM/svpBy2Vx8dxpwaa5deWM6+Ot3T8jJb5myu6cZoxNDWkrK0nnfw2IPGfOjvc3b+bFc8OXQy3x8mDUvwsLA24ZZoZ7Bhest5cH68L4+TZk9YOWe7Rv1lkY6D09MGObxb9dhpmtRGRm7eavTZuZIXKm9Vvbc66//vt668oZeY4S7Cvy+pcH6+W1tMNX7j3d0+vcdbzNXL515QwnSb3/vTXVWbZhbbKls8/WygeHHfUd/R+YEZh58Zy0k0F/p2T1g5Z7tG/rqitttn7/jIzOM7OWSyl1mGmujl8zZb/T/MhtdrzfPdBy7Cuy+pcHT1upZna8v6e3Xi10zuQluXiOy58zw3yeqe+dM8NWndnxfl5gLs9YHROOZhcGet29XRgINrqW1Q9a3mgpgnZs4/BW750R0nlmOu5BCfccINvm53OIK6f12PdLp5nS+qJhYV3mYGZajcuS5/KdzOXB2i7oYaagnKtQa9bR7VtXzgjMtBYabHQtqx+0XBC3rpwRDUAcCb/1+2dkdJ6ZdZrLmbao5xwvowRmSuu30kzLItsvSAzMbPh1+a4f5mvkv6Iee26EmTEyM2jOtJ1v5E5yeP9Ou0ez/n7vbScn6ovmZfOxxNnxfquf9vOl9T24Xv/WlTNcmpUYaxus8qN6rue2HvL7Oj9it1azx1/9oOXm1+VYorDPfH8wmm21mfI7p21zwz0HaNl2+kSwMwlGp/JRrqwpvtw20JoRnYkRhlWzfhhsTtsH0vX26+X9F8eH2RjYGhIPzNTb5FKx2c7gsPtQ03UGiPsqxMeHjpWS1Q9azs5p2XOj9xk1nAGKMGf6XxNcAxRR2P9q0sawnfTyEfirSSzMNFcHZkahhPgo7lijwRGvqD6uNIiDmciZiIZxXDtjC1DHTHN1YCZCGse1H7YAdcxEzkQ0jOPaGVuAOmaaq4NnGgAVUMdMPAcIqIQ6ZpqrAzOBCqhjJnImUIlYmym+c3pzJVm/Nmhuybk6MBOoQHzNlN45LbiQnVLkTKAWXmYeAADahJeZv/sma/L06dMffvhhZmbm0qVLly5dmuBwlwAAZHiZ+Wdwnj9/PjMz8+zZs3K5XAIAhMXLzJe+eWGSy+UmJyf39vZKpXKpVCoW61EoFAuFIl+CQCBk4WXmazu5XI5N7OzsFAqFnZ2d1y62t7enpqbK5b1SqVQoFEKcQwIA5PP5wGYyLT/66KNCoSAzs1Qq5/OFnZ3dra1tBAIRIoKZybR89913v/jiC08zSzu7+a2t7VxuE4FAhIgAZjIt33nnnVOnTl29etXDzGKxtL29k8ttvnr1GoFAhIgAZhaLxffff//DDz/88ssv5+fnPcx8/Tr35MnTR48er639hkAgQkTgnPnJJ5+Mjo7evHnTw8xXr15ns3+sr//vwYNfEQhEiAhznPnVV18tLy97mPny5atHjx4/fLh29+59BAIRIkKem11aWvIw88WLl+vrj+7de7C6egeBQISISP6e+efGs7t37//0039//PE/CAQiRIQx0wNm5uPHv6dSP37//b9u/zOFQCBChJeZW77ZNNnd3Z2dnV1dTf/888M7d342jLsIBCJEeJm5Y2d3d3enEfl8/t69e/Pz838DADSBl5k5AECb8DITANAupGYCANoIzAQgjsBMAOIIzAQgjkjNHBmd6NBo91cKQAvwMvP4nq3ZOmAmUAMFzYx/tHujgw5AQTOr8QZmAj+EMVPTDWEkNGcco5I1RkYninZSqVQqlVq0Mz19rdgOYCbwSUgzdYPWQqeaJLzNJIR4vG2hmbru7EYul9N0HWaCONOanOnOlgnNSCSaMpPI8TazYMcys1AoGFvU2KLXV/OaphfaweHhIcwEfghjJp+F0um0NZ1KpdjEwcGBrhuJhNZQSw/xeANl00IzHWvIeru+vm4YRjqdvr6a13VD0/SmvjVCQszK5/MwE/ikWTMtGymli4uLTEuWqU6ePNlQSw/fQufMXTu6buiGsbi4qOvG9PQ1Fpqm7/qGEOJnQgbfFMwEPglj5vT0tfX19XQ6nbLD9n52fsXbTLdgQjMbTgvN3LbjPs68vpqvJU/D0A0jm81uN4IQwk/wr44Ksg8yKpUKzAR+CGmmNc3nTF032NGUsUWnp6/JzHQIJsuHoXOm43kLum5sbGywe94Mg15fzV9frf8HXjbqzmaz/h/gsLW1RQhxl8jgq8FM4JOWjWYPDg4WFxetsyzeZnrb1Uz9kdGJTTu6bmSzWVtiNwy2GlTXdN1Ip9NMzk0RhBB+2o27muzjm5ubMBP4JIyZk5OThmGwHd06hGOv1rGcrusNR7PMN2E+9EhB3mlzZHQia8c9mq2ZSSmlNJvNJjQtkdCYnEIIIY4J4SwZfP39/X2YCfwQ0sz6Xq4b7JRPoVCYnr5mbFE2YpycnPQ4N+sQVTjNl/Cv3oyMTmTsMDNZMs/lcsaWaaauUU2jlGp6QteNhKZlGiEUz5ol+wj/FmYCnzRrJhvBWseW1oFcQzP5nCkzk7jO4jaUc2R04pEdy0ympbFlG40XCoVsNqsbRiKhPWoEIURW4pEz+fowE/gkpJnWmVh+BMtOyU6ayMx0DEeFw1R3HdnH3Wb+Zod5aGlpGKaZmka1xMbGhqYnmJm/ySGEsFc3sspC9vb2YCbwQ0gzT548mUhojld+giFrwSGqcFpWx5uR0Yk1OzYzDaoZCevcci6XW19fT6VS7AztmgRCiGNCNstd0/ERmAl8ouC9Jr/YYWdf2fUGLGpmagmqJdLpdEJLMDN/EUEIEU47StiEo4K7sFwuw0zgBwXNfGCHnd359NNPE5rGgplZu9LAHI0nEtqDRhBCHG9ZCV/uGOs65sJM4BMFzbzfCOahOxp+sHlKpRLMBH5Q0Mx7MQZmAp8oaCYCoUCoZiYAauDLzNm5fyAQiOMMv2ZG+vNQLBYjbb/ldFyHQccBM8PQcR0GHUcszCwUCpG233I6rsOg41DfTPeVff6v9ZMBM0HUxNnMJY1oSz4ebiArt+Y62pWYWVtcEx0GoGXEwsx8Pu8uzIwl3aJ4pDuZkO5yqcm+3RR2GIAWEgszd3d3XWViS5o0U/hxrlD4a+CzwwC0Er9mHh5W3xxUoohq9ejlq9fO9hc+I2cX3ZUJIbJ2+BzI13RMOFpwvL1xlpxd8NXh9m0y0BX4NbNyWN1/8zaKqFaPnr946Wj/4TcnTnyztv/mrcdBJoPVtyasaeEsRwX3LGu5DTvcvk0GuoL2m3l0dPTs+QuZmUKjvMv9mOku9G8m63D7NhnoCnybWTnc2z+IIqpHRxvPXjjaf/D1iRNf/+qoSQixXoXBV7Cq8fU9cq/HcoUdbt8mA11BTM3cu3GW9C24rfM2U1jNEtVDbKvwuz7Sd8NXh9u3yUBX4NfMt5XD8t6bKKJaPXr65zNX+zf6yNl58y0hpNxo2v02eJ1fRk7UF+rd4fZtMtAV+DXz4G2lVN6PIqrVoydPN9zt3x858Zf5/VJ5nxDCl/NvZdOy+uytkFJ5vzTfR/pu+Oxw+zYZ6Ap8m3lQKZb2oohqtfrHkz9F7X/3F9JHCHF/hDfKKvGo5igU1mSL+7vvDrdvk4GuwK+Zbw7eForlKOKwWv39j6fRtR9Rh9u3yUBX4NfMX4Gd9m0y0BX4vwYoQiqVSqTtt5xKpdK+TQa6Ar9mRv6kMEI66LV92wt0CwHMjK4T+Xz+ZoZ2SpCmb+8EoCFxMZMQ0nblfAZyJjgG4mJm231DzgSxIi5mImcCwNO8mQEe0iHDI2de+Lh2tcCpbxvP8ighHy8hZ4IOohkzM2NJtte3wExxzvxWIx+MXc3Qm5mlU0S74D3LXXJ77L1aSebzD5Kf30bOBB1D3HOmGR5quWeZJd9qVqq88LEg6yJngtgSwEzJA0cWz5LPbjT3wJHGx5m3x95z5EyPWWbJ1fPJ985nWCE/jZwJ4k8AMyWPNVjoI5/daO6xBt458+r5pPA4UziLL4nITORMcAzExcxG52Yzn38gG466Z9VKkDNB5xLETPFjDRb6yNnvmnusgZ+/Z3qo5Z5VK8FxJuhY4mKmMGdePZ801XImRvcsQWWcmwUdSwAzJQ8csT0WJFz4+XummRXrfz5xzfIqwd8zQWcRwMzoHjiCa4AAcBDEzMgeOILrZgFwEMDM6B4IgpwJgIMAZkb35A7kTAAcBLoGKCqQMwFwEJenjeTb/QCRQK/t216gW4jF/88EADiAmQDEEZgJQByBmQDEEZgJQByBmQDEEZgJQByBmQDEEZgJQByBmQDEEZgJQByBmQDEEZgJQByBmQDEEZgJQByBmQDEEZgJQBz5P2jLkgRirph9AAAAAElFTkSuQmCC" alt="" />

2、使用Convert(decimal(18,小数保留位数),字段名/数字)方法,如下所示:

select Convert(decimal(18,1),3.333)

结果如下:

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

这两种方法的区别在于:Round函数的小数点后面的位数不变,保留位数后面的数字替换为0;而Convert方法只保留你需要的小数点位数。

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