Question

目前我得分为＆＃34; 25/50＆＃34;作为字符串通过SQL，现在我需要从这个分数计算百分比并使用Post Gres SQL中的SQL语句返回该值。

SELECT es.score FROM emp_scores es WHERE id = 123;

这会给我一个字符串＆＃34; 25/50＆＃34;。现在我想从这个字符串中计算出百分比。

Answer 1

您需要首先拆分数据，然后才能计算百分比...... 你可以用

    split_part(string text, delimiter text, field int)  
   //Split string on delimiter and return the given field (counting from one)

这是示例

SELECT (CAST(coalesce(split_part(es.score,'/',2)*100), '0') AS integer)*100)/CAST(coalesce(split_part(es.score,'/',1)*100), '0') AS integer) as 'Percentage' FROM emp_scores es WHERE id = 123;

Answer 2

select 
cast(substring(es.score,0,patindex('%/%',es.score)) as int)/
cast(substring(es.score
       ,patindex('%/%',es.score)+1
       ,len(es.score)-patindex('%/%',es.score)) as int)*100
FROM emp_scores es WHERE id = 123;

Answer 3

使用cte

的另一个例子

create table emp_scores (
   gid serial primary key,
   score varchar
);
insert into emp_scores values (123,  ' 25 / 50 ');

with t as (
    select regexp_split_to_array(' 25 / 50 ', '/') scores from emp_scores where gid = 123
)
select 100 * scores[1]::real / scores[2]::real from t;

我需要使用SQL语句计算得分的百分比

3 个答案: