\u89e3\u51b3SQL\u67e5\u8be2\u9047\u96640\u9519\u8bef<\/p>\n
\u7ecf\u5e38\u4f1a\u5728SQL\u7684\u67e5\u8be2\u4e2d\u5e26\u4e9b\u8ba1\u7b97\u8fc7\u7a0b\uff0c\u8fd9\u5176\u4e2d\u9664\u6cd5\u5f88\u5bb9\u6613\u78b0\u5230\u96640\u7684\u9519\u8bef\uff0c\u4ee5\u4e0b\u4e24\u79cd\u65b9\u6cd5\u53ef\u907f\u514d<\/p>\n
1\u3001\u7528\u6761\u4ef6\u8bed\u53e5<\/p>\n
select\u00a0 case when rate=0 then 0 else 1\/rate end as fieldname from tablename<\/p>\n
2\u3001\u7528NULLIF<\/p>\n
select\u00a0 1\/nullif(rate,0) as fieldname from tablename<\/p>\n
\u4e24\u79cd\u65b9\u6cd5\u90fd\u53ef\u4ee5\u89c4\u907f\u96640\u9519\u8bef\uff0c\u4e2a\u4eba\u8ba4\u4e3a\u4f7f\u7528nullif\u66f4\u7b80\u5355\u65b9\u4fbf\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u89e3\u51b3SQL\u67e5\u8be2\u9047\u96640\u9519\u8bef \u7ecf\u5e38\u4f1a\u5728SQL\u7684\u67e5\u8be2\u4e2d\u5e26\u4e9b\u8ba1\u7b97\u8fc7\u7a0b\uff0c\u8fd9\u5176\u4e2d\u9664\u6cd5\u5f88\u5bb9\u6613\u78b0\u5230\u96640\u7684\u9519\u8bef\uff0c\u4ee5\u4e0b\u4e24\u79cd\u65b9\u6cd5\u53ef\u907f […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","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":"default","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-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[44],"tags":[],"class_list":["post-1452","post","type-post","status-publish","format-standard","hentry","category-sql"],"_links":{"self":[{"href":"https:\/\/itoau.com\/index.php?rest_route=\/wp\/v2\/posts\/1452","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itoau.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itoau.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itoau.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itoau.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1452"}],"version-history":[{"count":1,"href":"https:\/\/itoau.com\/index.php?rest_route=\/wp\/v2\/posts\/1452\/revisions"}],"predecessor-version":[{"id":1453,"href":"https:\/\/itoau.com\/index.php?rest_route=\/wp\/v2\/posts\/1452\/revisions\/1453"}],"wp:attachment":[{"href":"https:\/\/itoau.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1452"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itoau.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1452"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itoau.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1452"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}