{"id":351,"date":"2023-09-16T10:44:53","date_gmt":"2023-09-16T02:44:53","guid":{"rendered":""},"modified":"2023-09-18T11:50:02","modified_gmt":"2023-09-18T03:50:02","slug":"sql%e4%b8%ad%e7%89%b9%e6%ae%8a%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%9a%84%e6%88%aa%e5%8f%96","status":"publish","type":"post","link":"https:\/\/mushiming.com\/351.html","title":{"rendered":"sql\u4e2d\u7279\u6b8a\u5b57\u7b26\u4e32\u7684\u622a\u53d6"},"content":{"rendered":"<p>\u5047\u8bbe\u5217STD123\u4e2d\u7684\u4e00\u4e2a\u503c\u4e3a\uff1a1803|123|456|789|147|258|369|159|753|951|357|222\uff1b<\/p>\n<p>\u6211\u60f3\u53d6\u6700\u540e\u4e09\u5217\u7684\u503c\uff0c\u5373\u4e3a\uff1a|951|357|222<\/p>\n<pre><code class=\"language-sql\">SELECT SUBSTR(STD123,INSTR(STD123,'|',1,9))\n\n--substr\uff08string,start_position,[length]\uff09\u6c42\u5b50\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u5b57\u7b26\u4e32\n--\u7b2c\u4e00\u4e2a\u53c2\u6570\u8868\u793a\u8981\u622a\u53d6\u7684\u5b57\u7b26\u4e32\uff0c\u7b2c\u4e8c\u4e2a\u8868\u793a\u8d77\u59cb\u4f4d\u7f6e\uff0c\u7b2c\u4e09\u4e2a\u8868\u793a\u622a\u53d6\u7684\u957f\u5ea6\uff0c\u53ef\u7701\u7565\u3002\n\n--instr\uff08string,subString,position,ocurrence\uff09 \u67e5\u627e\u5b57\u7b26\u4e32\u7684\u4f4d\u7f6e\n--\u7b2c\u4e00\u4e2a\u53c2\u6570\u8868\u793a\u6e90\u5b57\u7b26\u4e32\uff0c\u7b2c\u4e8c\u4e2a\u662f\u8981\u67e5\u627e\u7684\u5b57\u7b26\uff0c\u7b2c\u4e09\u4e2a\u662f\u8981\u67e5\u627e\u7684\u5f00\u59cb\u4f4d\u7f6e\uff0c\u7b2c\u56db\u4e2a\u662f\u67e5\u627e\u7684\u5b57\u7b26\u662f\u7b2c\u51e0\u4e2a\u3002\n\n<\/code><\/pre><\/p>\n","protected":false},"excerpt":{"rendered":"\u5047\u8bbe\u5217STD123\u4e2d\u7684\u4e00\u4e2a\u503c\u4e3a\uff1a1803|123|456|789|147|258|369|159|753|951|357|222\uff1b\u6211\u60f3\u53d6\u6700\u540e\u4e09\u5217\u7684\u503c\uff0c\u5373\u4e3a\uff1a|951|357|222SEL...","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[82],"tags":[],"_links":{"self":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts\/351"}],"collection":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/comments?post=351"}],"version-history":[{"count":0,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts\/351\/revisions"}],"wp:attachment":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/media?parent=351"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/categories?post=351"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/tags?post=351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}