创建测试表及数据 1 2 3 4 5 6 7 8 9 create table test (name varchar2(10)); insert into test values ('2-15'); insert into test values ('2-33'); insert into test values ('2-3'); insert into test values ('12-8'); insert into test values ('12-22'); insert into
例如:在产品表product表中字段content值为["10"],然后在产品表中新建一个字段product_id,提出字段content的值10,如何实现呢? 解: update (select id,substring(content,3,instr(content,"\"]")-3) as product_id FROM `product`) b,product a set a.product_id = b.product_id WHERE a.id