\u5df2\u77e5\u7684MyCat\u4e0d\u652f\u6301\u7684SQL\u8bed\u53e5\u7c7b\u578b\u5982\u4e0b(\u4e0d\u5b8c\u5168\u7edf\u8ba1\uff0c\u540e\u7eed\u4f1a\u66f4\u65b0):<\/p>\n
<\/p>\n
SELECT\uff1a<\/p>\n
\u00d8\u00a0\u8de8\u5206\u7247(\u5b9e\u4f53\u5e93)\u7684\u4ea4\u53c9\u67e5\u8be2<\/p>\n
\u00d8\u00a0\u8de8\u8282\u70b9\u7684\u8054\u5408\u67e5\u8be2\u00a0(\u5982\u7528\u6237\u5e93\u7684\u8868\u548c\u5e73\u53f0\u5e93\u7684\u8868\u505a\u8054\u5408\u67e5\u8be2)<\/p>\n
INSERT\uff1a<\/p>\n
\u00d8\u00a0\u63d2\u5165\u7684\u5b57\u6bb5\u4e0d\u5305\u542b\u5206\u7247\u5b57\u6bb5\u00a0(\u5982\u63d2\u5165tbl_user_base_info\u8868\uff0c\u6ca1\u6709\u63d0\u4f9buser_id\u5217)<\/p>\n
\u00d8\u00a0\u63d2\u5165\u7684\u5206\u7247\u5b57\u6bb5\u627e\u4e0d\u5230\u5bf9\u5e94\u5206\u7247<\/p>\n
\u00d8\u00a0\u590d\u5236\u63d2\u5165Insert\u00a0into\u2026select\u2026<\/p>\n
\u00d8\u00a0\u591a\u884c\u63d2\u5165\u00a0insert\u00a0into\u00a0tab_a(c1,c2)\u00a0values(v1,v2),(v11,v21)\u2026<\/p>\n
UPDATE\uff1a<\/p>\n
\u00d8\u00a0\u66f4\u65b0\u7684\u5217\u5305\u542b\u5206\u7247\u5217<\/p>\n
\u00d8\u00a0\u591a\u8868\u66f4\u65b0\u00a0update\u00a0a,\u00a0b\u00a0set\u00a0a.nation=\u2019China\u2019,\u00a0b.pwd=\u2019123456\u2019\u00a0where\u00a0a.id=b.id<\/p>\n
\u00d8\u00a0\u590d\u6742\u66f4\u65b0\u00a0update\u00a0a,\u00a0b\u00a0set\u00a0a.nation=\u2019China\u2019\u00a0where\u00a0a.id=b.id;\u00a0\u00a0\u4f46\u652f\u6301\u5b50\u67e5\u8be2\u65b9\u5f0f\u00a0update\u00a0a\u00a0set\u00a0a.nation=\u2019China\u2019\u00a0where\u00a0id\u00a0in\u00a0(select\u00a0id\u00a0from\u00a0b);<\/p>\n
DELETE\uff1a<\/p>\n
\u00d8\u00a0\u590d\u6742\u5220\u9664\u00a0delete\u00a0a\u00a0from\u00a0a\u00a0join\u00a0b\u00a0on\u00a0a.id=b.id;\u00a0\u00a0\u652f\u6301\u5b50\u67e5\u8be2\u65b9\u5f0f\u00a0delete\u00a0from\u00a0a\u00a0where\u00a0a.id\u00a0in\u00a0(select\u00a0id\u00a0from\u00a0b),\u00a0\u4f46\u8868\u4e0d\u80fd\u8d77\u522b\u540d<\/p>\n
\u5176\u5b83\uff1a<\/p>\n
\u00d8\u00a0Call\u00a0procedure()\u00a0\u00a0\u00a0MyCat\u672a\u652f\u6301\u5b58\u50a8\u8fc7\u7a0b\u5b9a\u4e49,\u00a0\u56e0\u800c\u4e0d\u5141\u8bb8\u8c03\u7528\u5b58\u50a8\u8fc7\u7a0b\uff0c\u4f46\u53ef\u901a\u8fc7\u6ce8\u89e3\u6765\u8c03\u7528\u5404\u4e2a\u5206\u7247\u4e0a\u7684\u5b58\u50a8\u8fc7\u7a0b<\/p>\n
\u00d8\u00a0Select\u00a0func();\u00a0\u4e0d\u652f\u6301\u8fd9\u79cd\u65b9\u5f0f\u76f4\u63a5\u8c03\u7528\u81ea\u5b9a\u4e49\u51fd\u6570\uff0c\u00a0\u4f46\u652f\u6301\u00a0select\u00a0id,\u00a0func()\u00a0from\u00a0employee\u00a0\u53ea\u9700employee\u6240\u5728\u7684\u6240\u6709\u5206\u7247\u4e0a\u5b58\u5728\u8fd9\u4e2a\u51fd\u6570\u3002MySql\u81ea\u5e26\u51fd\u6570\u53ef\u968f\u610f\u4f7f\u7528\u3002<\/p>\n
<\/p>\n
<\/p>\n
\u6ce8\u610f\u4e8b\u9879\uff1a<\/p>\n
\u00d8\u00a0Order\u00a0by\u5b57\u6bb5\u5fc5\u987b\u51fa\u73b0\u5728select\u4e2d\uff08MyCat\u5148\u5c06\u7ed3\u679c\u53d6\u51fa\uff0c\u7136\u540e\u6392\u5e8f\uff09<\/p>\n
\u00d8\u00a0Group\u00a0by\u52a1\u5fc5\u4f7f\u7528\u6807\u51c6\u8bed\u6cd5\u00a0select\u00a0count(1),type\u00a0from\u00a0tab_a\u00a0group\u00a0by\u00a0type;<\/p>\n
\u00d8\u00a0MyCat\u7684\u4e00\u4e9b\u81ea\u5e26\u51fd\u6570\u00a0sum,min,max\u7b49\u53ef\u4ee5\u6b63\u786e\u4f7f\u7528\uff0c\u4f46\u591a\u5206\u7247\u6267\u884c\u7684avg\u6709bug\uff0c\u6267\u884c\u7684\u7ed3\u679c\u662f\u9519\u8bef\u7684<\/p>\n
\u00d8\u00a0\u8c28\u614e\u4f7f\u7528\u5b50\u67e5\u8be2\uff0c\u5916\u5c42\u67e5\u8be2\u6ca1\u6709\u5206\u7247\u67e5\u8be2\u6761\u4ef6\uff0c\u00a0\u5219\u4f1a\u5728\u6240\u6709\u5206\u7247\u4e0a\u6267\u884c(\u5b50\u67e5\u8be2\u5185\u5916\u5c42\u7684\u8868\u4e00\u6837\u8f83\u4e3a\u7279\u6b8a)<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5df2\u77e5\u7684MyCat\u4e0d\u652f\u6301\u7684SQL\u8bed\u53e5\u7c7b\u578b\u5982\u4e0b(\u4e0d\u5b8c\u5168\u7edf\u8ba1\uff0c\u540e\u7eed\u4f1a\u66f4\u65b0): SELECT\uff1a \u00d8\u00a0\u8de8\u5206\u7247(\u5b9e\u4f53\u5e93)\u7684\u4ea4\u53c9\u67e5\u8be2 \u00d8\u00a0\u8de8\u8282\u70b9\u7684\u8054\u5408\u67e5\u8be2\u00a0(\u5982\u7528\u6237\u5e93\u7684\u8868\u548c\u5e73\u53f0\u5e93\u7684\u8868\u505a\u8054\u5408\u67e5\u8be2) INSERT\uff1a \u00d8\u00a0\u63d2\u5165\u7684\u5b57\u6bb5\u4e0d\u5305\u542b\u5206\u7247\u5b57\u6bb5\u00a0(\u5982\u63d2\u5165tbl_user_base_info\u8868\uff0c\u6ca1\u6709\u63d0\u4f9buser_id\u5217) \u00d8\u00a0\u63d2\u5165\u7684\u5206\u7247\u5b57\u6bb5\u627e\u4e0d\u5230\u5bf9\u5e94\u5206\u7247 \u00d8\u00a0\u590d\u5236\u63d2\u5165Insert\u00a0into\u2026select\u2026 \u00d8\u00a0\u591a\u884c\u63d2\u5165\u00a0insert\u00a0into\u00a0tab_a(c1,c2)\u00a0values(v1,v2),(v11,v21)\u2026 UPDATE\uff1a \u00d8\u00a0\u66f4\u65b0\u7684\u5217\u5305\u542b\u5206\u7247\u5217 \u00d8\u00a0\u591a\u8868\u66f4\u65b0\u00a0update\u00a0a,\u00a0b\u00a0set\u00a0a.nation=\u2019China\u2019,\u00a0b.pwd=\u2019123456\u2019\u00a0where\u00a0a.id=b.id \u00d8\u00a0\u590d\u6742\u66f4\u65b0\u00a0update\u00a0a,\u00a0b\u00a0set\u00a0a.nation=\u2019China\u2019\u00a0where\u00a0a.id=b.id;\u00a0\u00a0\u4f46\u652f\u6301\u5b50\u67e5\u8be2\u65b9\u5f0f\u00a0update\u00a0a\u00a0set\u00a0a.nation=\u2019China\u2019\u00a0where\u00a0id\u00a0in\u00a0(select\u00a0id\u00a0from\u00a0b); DELETE\uff1a \u00d8\u00a0\u590d\u6742\u5220\u9664\u00a0delete\u00a0a\u00a0from\u00a0a\u00a0join\u00a0b\u00a0on\u00a0a.id=b.id;\u00a0\u00a0\u652f\u6301\u5b50\u67e5\u8be2\u65b9\u5f0f\u00a0delete\u00a0from\u00a0a\u00a0where\u00a0a.id\u00a0in\u00a0(select\u00a0id\u00a0from\u00a0b),\u00a0\u4f46\u8868\u4e0d\u80fd\u8d77\u522b\u540d \u5176\u5b83\uff1a \u00d8\u00a0Call\u00a0procedure()\u00a0\u00a0\u00a0MyCat\u672a\u652f\u6301\u5b58\u50a8\u8fc7\u7a0b\u5b9a\u4e49,\u00a0\u56e0\u800c\u4e0d\u5141\u8bb8\u8c03\u7528\u5b58\u50a8\u8fc7\u7a0b\uff0c\u4f46\u53ef\u901a\u8fc7\u6ce8\u89e3\u6765\u8c03\u7528\u5404\u4e2a\u5206\u7247\u4e0a\u7684\u5b58\u50a8\u8fc7\u7a0b \u00d8\u00a0Select\u00a0func();\u00a0\u4e0d\u652f\u6301\u8fd9\u79cd\u65b9\u5f0f\u76f4\u63a5\u8c03\u7528\u81ea\u5b9a\u4e49\u51fd\u6570\uff0c\u00a0\u4f46\u652f\u6301\u00a0select\u00a0id,\u00a0func()\u00a0from\u00a0employee\u00a0\u53ea\u9700employee\u6240\u5728\u7684\u6240\u6709\u5206\u7247\u4e0a\u5b58\u5728\u8fd9\u4e2a\u51fd\u6570\u3002MySql\u81ea\u5e26\u51fd\u6570\u53ef\u968f\u610f\u4f7f\u7528\u3002 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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