摘要: select to_month_end(date) select extract(year/month/day from date) select lastday(date/timestamp) select (date-date) day(3)/month(3)/year(3) select months_between(date,date) select (time-time) hour(3... 阅读全文
posted @ 2019-07-11 22:28 king_cobra_rko 阅读(1963) 评论(0) 推荐(0)
摘要: select regexp_similar('iuh()87%^&6888dkfj','.*[0-9]{4}') select regexp_instr('我的apple998','apple') select regexp_replace('我的apple998','.*[a-z]{5}','pp 阅读全文
posted @ 2019-07-11 22:20 king_cobra_rko 阅读(3230) 评论(0) 推荐(0)
摘要: Teradata可用trim()函数去除字段中指定的字符,但前提是该字段有确定的模式,比如均为字母+数字+字母的模式‘abc258mnj’ 去除字母:select oreplace('258mnj4102',trim('258mnj4102','0123456789'),'') 去除数字:selec 阅读全文
posted @ 2019-07-11 22:10 king_cobra_rko 阅读(1539) 评论(0) 推荐(0)
摘要: sql自关联,with as 阅读全文
posted @ 2019-07-11 00:10 king_cobra_rko 阅读(1638) 评论(0) 推荐(0)