第三,MySQL允許通過指定FIRST關鍵字將新列添加到表的第一列。 如果沒有明確指定新列的位置,MySQL會將其添加爲最後一列。 alter tableaddcolumnmysql alter tableaddcolumnmysql2025 alter tableaddcolumnmysql alter tableaddcolumnmysql 其次,將新列及其定義放在ADD alter tableaddcolumnmysql alter tableaddcolumnmysql2025 COLUMN子句之後。
6C+m+nv/AMrT/wA6QtK9Vb0INryZRRk+SLgwmFR6HWWkLlVR0Fu1ZZaqplPDHDBcYZJHnGcBrXEnkCu1dL5ZbDTMq75eaG3QPeI2y1dQyFjnkEhoc8gZwCceopK1rqSg4vL7MPIcXyaO+ip1o1Hp7UAlNgv9suYhwJfgVZHPwZ6cXATjOD1Xfc5jAXPeGhoLiScAAdT7FHOlUpS3Jpp93aUcexnJRhUA6/0EflDXGnsHofyrB/Mqlbr5Y7w3NovVBXADJ+DVLJR/+pKllaXEVmUHjyZXda7DuphfGrraOgppK2uq4KaniHFJNNIGMYPEuJAA9q69qv8AYr6JTZL3b7iIOHtfglVHN2fFnh4uAnGeF2M9cHwUUaM3F1Ip47ymHzO9hSio1drHSFtqpKK46rs1JUxHEkM9whjkYcZ5tc4EciOqrSo1KzxSi2/BBJvkVlFb/wCf2g8Z/PfT2P8AvWD+dV2KWKeOOeCRskUjQ9j2HLXNIyCCOoIVatvVorNWLXmg01zOaIiiKBERAEREAREQBERAEREAREQBQVK4uxjORy8U8ip8LjcaKz2+pu11qmU1HRxOnnmeQGsY0ZJJ9gWh2tdYXTefcKfUVT2gt0RNPbKdw5Q0wPLl+07q4+OB0AWTvKs3TlvVybtFp6pJip3slvT4yAHvwHMgJHUDIc4ftcPgQrc230f2TGSOj5gDqvvn0d7LrT7dalcrE5/h8I+r+RvNOtujj0kuZeOh9Mx0dOzLOgz0V/xRiNrWgdy69BSspY2tDT0XcX0uTyzZhERWgIUREGW5rCBzoqecDkxxY76x/wCSre127Nbto6MU7ZDGy+267ScHfHB2rZWY/wA6OZwHrXG5UbK6ilpnZy4fJPge4qwponxSvhlaQ5h4SMf7f7YX0bZmtRv9PdnPnH5c0fOdp6Naw1BXtPlL5rmexNLNHU07KiF4fHI0PY4HIIIyCFhm0+U5p2677VeyjbVM10LpKWG5dq0slrI2cckXB1AADwHZ5uYRjmCrg2A1hT6l2a0tdJ6yLtW25kE3E8ZDoxwc/X8laS6AqD8cJk8s7Dxa1uLu04hwkGafnnwI/vC0llpsavTqr/YnjzOj1DVp0o28qL/G1nyZ6E6z1Jb9F6Uu2rLm7FLaaOaslA6uDGl3CPWcYHrIWnvkX6n1jrTe3V2qLxcJ5YbjbXT3GMucY+3dOzsG46fJaJmt8ACsr+Wxq6G1bMS2qlq2Ca9V0FKWteMmNru0d09bAsD7F706G2P2avdwoqkV+t71WlrKPsnfomsZiIvdjh7NuXO5HJLiPZPp9lJ6fUnCGZSe6vUxNU1BR1OnTnPEILefi+4pvlsath1DvC60UkjZI7BRR0jy09JnEve36st/esfWyHsbfTxHqIxn2q2aUXHU99nul0q5KqepmdV1c8nN0j3HicSe8lxyrwAAGAMerwVu0dSFvQo2Ef7OL8y3Z2nO5uK2pTXCXBeRKIi487Ayyz0AnPHLwRnoBSOi8gXfG5n5v5nJT5ssjczaPTG60dtZqWruUH5L7Yw/A5WMz2nBxcXEx2fQGMY71qHvFt7ZNA7i/mnZKmrlo+zp5C6qe18mX5yMta0ezl9q3yK008pg/wDrtx/1FF/eV3uw+o3FSs7WUvsRi8L916mVaVGpYM36L8mrQOj79bdW2u5Xt9bQu7aNk08RjLiwg5AjBx8rxCxj5T1/rNY7i2TbGzPL20b42OA6GqnIGT/QZw/2nLZysuVHZbHNdrhM2KmoaR1TM89GsYwuJ+wFaL6c3InpN0JNzLnYpLrIaqWq+CiXg4XvBDPlcLvRB8OeFk7OO61O6q39d77pJqPm88C6hvVJub44Mg7UVMmzu/8AcNC1kzxbrlUPtzXvGMgnjpZD6zkN/rnwW099bmy3EFv/ACWX/UK0b3V3HOvdXUusKPTsljqoImMJ7Yycb2OJa/PC3BA5ewLciw6mg1jttBqinOW3C1PlcP2ZOAh7faHBw+pRbU2U+ktb+ccSbjGXLg0LiPGE+0052J290/uTq+bT+o6uqpqWO3SVTX08rGPL2vjaBlzXAjDz3dy7m72irXtBrSih0JqirqJDCKjJlaZ6aTiwGl0eAc9QOEKl7Lba0W6Wq5dOV11loY4bfJViSKIPcS18beHn3Hj/AHBXDuVtrNsDqKy3e1XGku7KjjkhZXUTHdm+Mtzlhy0jmMEYxzXaVa8Oseg6Ti4f08cH45wZMpLpcZ7ORsZuTVV9Z5P94q7qwtrJ7Gx84IxiQtaXcvasY+Ra0A60+SB/vZ//AKlkTW+pTrHycrnqd8IgdcrIJ3Rt6NcSMgerOVjzyLs41mcE8rX0/wDulxVtSlDQ76DWHvvh+64IxUmqE/M2Z71pFvJQU958oa42iqe9lPWXWhppXswHNZIyFriCQQCASea3cGT3YPr6LSHee1svnlBXKySzGJlxudFSF4GSwSMhYXAeIzn6libA4V3W3uH2H80Us2lJvPYZod5Ju0bcj84L8cd/w6n90s3W+hhtlBS2+nc8xUkEdOzjILi1jQ0ZwAM4C18i8jOwwyMlbrWtJY4OA+CM7v6y2JjZwMYzPFwNDQT1IC1u0l3G4jCNO4dVZfBxxj/0iry3n+LJ9EUKVypjhERVAREQBERAEREAREQBQVKg9EAAz0CxxvrutSbV6Okq4JozfLkH01qgJHE6THOXH7LMgk+JA78K/LrdLdZrZVXe71kdJQ0cTpqieU4bHGBkuP1f7c1ojrLV9z3o3Cn1PURSsoWH4NboJOfY04Jxy7i70nes+oLu9hNm5a7e9NXX3VPGfF9i9fAzrK2daW9Lkj4aB0zUXKudcK4vmnqJHTSyv5uke48TnE95JJWwunLQyip2DswC0DKt3Q+moaOnYSzGB4LIEcTY2cLF6NkoxW7E6PCSwjkAApRFYUCIiAIiIVI5d4VKvVkZch2sQDJxy4j0ePA/xVW71GOec/vWVa3lWyqqtReGYt3Z072i6FZJosJ/5Stjn0z5Kina/wBNjXua132HBXUaC1wI5YOQR3exZGkjZMwxzRsew/quGQuk+w2p5y6jYP6JI/uXa2u2FHdxXp4b54OHudjrje+4qLHZnJZM9XVVOH1dRLKWcgZHl+B6s9F3LbZq24vD2MLIT1kPIY9Xirtis1shcHR0UWR0JbxEfau5jnkKO82wTg4WsMN9pNZ7HPfUrueUuxHWobfTUFM2npmkftOPU+tdodERcTWrTuJudR5bO3pUoUIKnBYSCIiiJDLLPQCkdAoZ6AUjuXkG6/Mz838zkp82CMrXnePYXW+vNx/zssc9qbRiKnYW1FQ5kmY88XIMI9nNbDqMDOe9Zmk6rX0eq61FJtprj3MQm6byiwt3tKat1ft9PpTSk9HFU15jjqX1MrmN7FvNzQWtdzJAHsz4qk7EbSy7aaYqqPULKKe619UZZnQ5ka2No4Y2hzmg9Mnp1ceqynjxTGOneplrdxGylYxSUW8trg8+ZcqslHc7Cwt4NtY9w9CVlgttNSx3FkkdTRSv+Q1krTz4iATgsL29D6QPcqHsrt5rjQeirvpLVNRb5I5nSSW8087pBGZGEOacsGG8QDhjPNzllktB6hSlLXbmFo7OWHHeUk3xaa48x0st3cfI1I075N++2ka43LTWoLPbqt0RgdNT17w4sJBLc9n0Ja37AqqPJo3T1hd4a/czXEM8cRDS8TyVMvZ56N4mgN/uW0IAAwBhPrW3q7a39RuShBSxjOOJK7yo3ks3V+hhWbV1+gNMRwQF1uFDRiZxDG4xjiIB8OuFgPTOwPlBaO+E/mrqq12z4ZwduKeve3tODi4c/ou7jdj+kVteefVFg6ftLd2FKdJKM1J5e8sllO4lT4Iw5tZo/fWx6q+G7h6xjudo+CyM7BlW6U9qS3gPCWN6c+/vVlbm+T7uRqjcy56203WWiCKaohqaR8tU9krHMYwB2AwgEObkc+4LZcjKYUlHam5t7p3dKEFJx3cJYWM57xGvKMt5Gtn+Lfyric/4yKc5/wDmT/dLYi1Q10FqooLhN2tVFTRMqHh2eOQMAcc8s5dldvuwgAHILC1PWZ6moqdOMce6sZ8y2dVz5jvUoi0pFyCIiqAiIgCIiAIiIAiIgCKMlY0363Yp9rdHSS0cgdfbo19NaojzxIRzmeP2WZz6zgd5xm6bp9fVLqFpbrMpP/34F9Om6styPMw35VG6o1DchtNpmdz4KOZr7zM0/JfKObYAe8Nzl3cHADqCqBtxpFsTInSMGeROQrN0DpqouVY6vrnSTVE7zJLK/mXvJySfXklbD6dtDKOnjwzn6wvU2iaRR0OxhaUeS5+L7WdRQpKhTUEVOgpWU8DWNaOncu4OihuAMAdFK2XMlCIiAIiIAiIgCgk9wP1BSqffo62W1Tst5k7fDSAx3C5zQ4FzWnucWggHxIV9OO/NR7yOrUdKDmlnBUDy7kVtUlJcoGQXHTdwfW0kwy6jrpTy/ovwXNIPIg5XZ/OOaic1t+tMtAzkO3a8Sw59bhgt+sYWXKzlL+k1Lw7fgzEjfxX9VOPy+KK4i4scx7Q+N4e1wDmuB5EHouSwWmnhmdFqSyuQREQuCIiFDLLPQCkdyhnoBSO5eQLv8zPzfzOSnzZKIihLAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAhEKewJjKB07xdrbYbVWXq71LKahoYXTzyvHJrGjJPrPgO/otENWauuu9O4NRqqsgkhowRBb6Rzs/B6cdAcfrO9J3dk46ALJXlTbqS6kvLNp9Oz/AOR0UrZLvKx3KWbHyIP6Lc5d4u4f2VRdudItiijkdFj6l6A+jvZlaZa9Y3EfvKnLwj6s32n2zpR6WXMvDQ+moqKnjJjxyB6K/oWhjeEDGF16GlZTxNa1oHLC7eAF9Gby8myCIioAiIgCIiAIiIAoPjk5Hd4qUVVzGMlFpmwRXavstUwGnrW/CoWuHJ2RwysHsPC7+uqnHSsZTMpHudI2OMRntHcZeAMfKJ6k966F3bHPcbTT8DRJ8IdPxnq1rGHIHtLgPZlVXDsZ6rLuJPdjPtfz5ZMG3pR35Qa5fJ8S2yPzPqIg17jZaiQR8DiSKJ7uhaf+bJ7u4q5AeWeLPgF8aylgr6SWhq2NfDO0se0jqCqZpSpmktzrdVkuq7bJ8FlPe4AfId9bcfv8FJVf1ml0n90efqR0v9LW6LP2ZcvDwK0igdSPtUrXo2b5hERChllnoBSO5Qz0ApHcvIF3+Zn5v5nJT5slERQlgREQBERAEREAREQBERAEREAREQBERAEREAREQBERARj9yxjv7uu3a7RktTbS11+uYdS2tjgD2b8fKmLTyIYDnB5E8IPIrIV5u1tsNqq73d6ttNRUMTp55XHk1rRk/wC3jgd60Q1Vqq9bzbg1Gqri6UUgPwe3UpJ4aalafktA8XElzj1Jd4AAd9sFsz11eq4rr7qm8vxfYv8ALM+xtnWnvPkjhoHTNRcas1tc5800zzJLLIeJ73k5JcT1JOTn1rYbT1qjo6djAMcvBW7ofTcVFAxzmAAgfqq/Y2BoAAwAvRTailFHQrhyOQaBjHcpRFYuICZXUuV1ttngFTc66KmjJ4QXnqfAeKi23a3XeA1Ftq46mMHhJjJ+SfAghS9BU6Ppd17veRK4pdL0O+t7uO3n1KcqOQ6ke1UmHVenaquFup7zTvqC7gDAervAHofBKdCpVy6cW8FKtxSotKckm+Sb5lXzlE5ZwCiiJgo5+CZ9a+8dDVztDoYHuB6HoMKKpXp0Vmo8LxZLSozrPdpxb8j45Ud67RtVx+bHGeeXD+K+JgnExpxE4vGOQ5qOF5bTyoTTxz5F7ta8Mb8Ws8ijXtxo56G8Fruyo5HichpcWxPaQXYHgeE+xUfR1dXtjbLeHvxeXvqqcv5cLsuHZ/WwBwHgD4K9RQV3zaUd3IL5VVDLwYq6V5aXB3yh3g5B+0A59SzKWr2k6XQbybfjx/Y11bRrhVfrKysccY4fucOXeqHcLfdKa8/l6xtjlMkQhq6aV5YJQDlrmu54cMkcxgjw77hdSTiBtQYj2Z55JC+LuMtcGY4iORcCQClrcxT3qbTzwfcSXlrvwxUTTXFd50qG709XKaSSKSlrGt4nU82A7He4EcnD1hd7mPSHNWZSGtvdY2hv9z+A3GmmMkUEdO1p5dHRSHJcMeGDjIIV5N6AeCy763VvJY5v4GHp9zO5g3JcE8Z7fgckRFgmxMss9AKR3KGegFI7l5Au/wAzPzfzOSnzZKIihLAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiKEBK44OOWSuQwThYu3/AN149sdGu+A1DBfbsHU1sj5FzXY+VNjwYCOfTJaFn6Xp9bVrqFpQWXJ/9f7F9OnKpJRjzZhzyqtz5NTXxu1GnqxxobfK2S7uiJxLOPlMhcf1gzk4j9rGebeVH240i2KOOR0ZyPUrL280pPW1IqqoulklkMj5H83PcTkuJPMkkkn2rYfT9pjoqZo4RkDuXqbR9Ko6FZws6HZz8X2s6ihSjQgoRKlRUraaENAGAOS7g6KB06KVsPMlCIhQcjH27mTDam4y3tn5+xq69kB0druS1SO4KK6sa6E9Bz5tH1Hiavvu2R2do/8ArP8A7mqobi2eSvslPc6MH4VbiJmFg+Vw8s49hAP1LsLStB2VK2qcp5X79jODvLeor+vd0uMqbi0vDtXwO9r29/kPTkz2P4ampPYRDvyep+oZ/d4rHc1kFhq9LsnZw1FXLHPKAehMjeFv1DH15VVp66bcTVFu7WF3weghbJPkcuLkX/2ncIHq9i7u4YDdW6fwcfpWAD/StWRZL6hiz/uak5fB4RjahN6rvXy/BFxjH4rLLir9WOodV0umfgQd8KY13bceC3PF3f1VcfIDDSce3Kx3qyKa2a8t+oqqCU0EcTA6ZsZcG44sg4/pZVf/AMYujy48N0Oc4yYnYWiu9P340p26zvLj5nR2OqOFStC6njdfBPhwOVn1b+VdS11g+BdmKIvHa9pni4XY6YWQa1lRUU0Rt8wxjnwPxlYX0PVQ1uvbxWU7w+KcSvY7GMgvCyw223Jn+5tcz2Pwua2w0+hb3VF7yg0k8S4p5XE6HY7UK91a1fsuWW1w5pJ8CXUt5jbxvfLgdeGTP9xXasZc+Sd78uky3m7ry7lNBBXQSukq5ndmGH0pMjqEts8Lqypa14HHJxNB7x4riry6nXt61GCjJfZe9BNdvFHa2dvGjWpVajafFbsnns5lNfX1xe4mpkbk5wHnkqjbp5Kqjnjme555j5RzywuEFoxI5lRFkZ5PD/8A+L7x0zbXT1D5JcsfnhPTu5fWpNSvbCpRhb26TnmOMLxRHZWt3SqSrV39hqXBs+VQf/QUXPuaqP7FWYwKy0thhI424y3Pgul+S63OREP7QWy0W6o2kKtO4lh774MwdVtqtzKE6SbW6uRSqy30VwYIqunbJwnia4jDmHxB6g+sL7xtc1jWukc8gek7qfau0+gqmODHNYC4gAF3jyXylikgeYpWgPb1AK6eF1CvFbksrsOelaujJ70cM4oiK4oZZZ6AUjuXFh+QFyC8gXf5mp5v5nJT5slERQFgREQBERAEREAREQBERAEREAREQBERAEREAUd6lcSQ3rhVXPKHE6d7vNq07aKu+XutipKChidNUTyOw1jGjJJ/h3k4Wh+pNT3TePX9Tq6vieyB5ENDA4Z7CmaSWN9R5lxx3uPVZG8qPdL86r+NqdOziWht0wkuszD8mSpHSEHvDMjP+dkdWqm7b6REETJHMznBxhegvo82Z6rtusLlfeVFw8F/yb/T7VU49JLmy8NFabjoYY3Oj6eIV+RxhjQ0Acl8KKlbBG0cOMBdoDC+ht5ZsQiIqZAUFShTIOOAfSAI8MIQByGSFyUYV3SPCWeC/wC8CmFl+PPxOEUMMIIhijYCcngYBn2rnwtJwTkDmM+KY9aOaHDBR1JOW83x788Sipxxu4WP9igXqr1jFXcNjtdDPTBgPHNJwu4ueRjPsXSFfuU44/IlsHsn/wDNXbjxTHLCz6WoqlBRVNcDWVtMdeblKo+PZwLR0fpO6Wq51t8vNRAaut4j2cHNrOI8RycePLAyPWrw7ef/AJ+T+0VxHLvUYWJeVvr9TpKuPhy8jMsLWOnU1Sovh/u8kukkeOF8jnDwJUDI6E8vtU4TCx1GEeCMxzk3lvJImnA/3V/9orsRXGdkBp5OGZju546Lq4TCgq2dtVik4Lg8/uSwuq0H9mTJDnNcXNc5p7sFchNP/wA8/wDtFccJjwUsqNKT4xT80RqrUSxkkySOILnOcQcgknkoJc48TiST4oiuUYx4xSRa5SfNhERXZLTEz/8ACK7ZN5Q6H1M8D9owN/ueVx84ztwOugtQ/eQ/zLz9yU4nHqSucn9H2z85OUqPF/8A0/UxHp1BvOD0C841tv8AQLUX3kH8yeca23+gWovvIP5l5+5PimT4q32ebPfofyl6jq237j0C841tv9AtRfeQfzKPONbb/QLUX3kH8y8/snxTJ8U9nmz36H8peo6tt+49AfONbb/QLUX3kH8yeca23+gWovvIP5l5/ZPimT4p7PNnv0P5S9R1bb9x6A+ca23+gWovvIP5lPnGtt/oFqL7yD+ZefuT4pk+KezzZ79D+UvUdW2/cegXnGtt/oFqL7yD+ZPONbb/AEC1F95B/MvP3J8UyfFPZ5s9+h/KXqOrbfuPQHzjW2/0C1F95B/MnnGtt/oFqL7yD+Zef2T4pk+KezzZ79D+UvUdW2/cegXnGtt/oFqL7yD+ZR5xrbf6Bai+8g/mXn9k+KZPins82e/Q/lL1HVtv3HoF5xrbf6Bai+8g/mUeca23+gWovvIP5l5/ZPimT4p7PNnv0P5S9R1bb9x6A+ca23+gWovvIP5lPnGtt/oFqL7yD+ZefuT4pk+KezzZ79D+UvUdW2/cegXnGtt/oFqI/wClg/ioP+Ea257tA6h+uaH+K8/snxTJ8U9nmz36H8pepTq237j0A841t19AdQffQ/xVN1P/AIQ/TFZpy4UumNG3ilutRAYqWeokjcyF7uXGQDk4GSAOpAHrWiOT4pk+JV9PYDQKU1ONDinnm/UrHTreLykZm05vFpS2VLqq5267VMr3mSV7Wxlz3E5JyX9Tz+1ZVs/lg7b2uBkX5ragJaMZbHB7xaiZPiUXYdHBLCRmpJcjdFvlu7dD/wB1tRfdwe9U/Hf26+i2ovu4PerS1FToolcG6Xx39uvotqL7uD3qfHf26+i2ovu4PerS1E6KBTBul8d/br6Lai+7g96nx39uvotqL7uD3q0tROigMG6Xx39uvotqL7uD3qfHf26+i2ovu4PerS1FToYDBul8d/br6Lai+7g96nx39uvotqL7uD3q0tRV6KAwbpfHf26+i2ovu4Pep8d/br6Lai+7g96tLUTooDBul8d/br6Lai+7g96nx39uvotqL7uD3q0tRU6GAwbpfHf26+i2ovu4Pep8d/br6Lai+7g96tLUVeigMG6Xx39uvotqL7uD3qfHf26+i2ovu4PerS1FToYDBul8d7br6Lai+7g94nx3du/otqP7uD3i0tTJ8U6GAwbpfHe26HXS2ovu4Pep8d/br6Lai+7g96tLUVeigMG6Xx39uvotqL7uD3qfHf26+i2ovu4PerS1E6KAwERFIVCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiAIiIAiIgCIiA//2Q==” width=”601px” alt=”alter tableaddcolumnmysql”/>