mysql - Mysql结果行到字符串，UNION

Question

我有一个名为 tblClients 的表，其中包含以下字段：idClient、姓名、信用、债务。

Create table tblClients(idClient int,name varchar(20), credit int, debt int);
insert into tblClients values(1,'Guillermo',1000,0),(2,'Jess',5000,2000);

我想对债务类型进行分类，例如

debt = 0 NOT                DEBTOR
debt between 0 AND 1000     LOW DEBTOR
debt between 1001 AND 2000  MEDIUM DEBTOR.

如果我进行此查询，我会得到债务人类型。

SELECT name AS 'Client',debt AS 'Debtor Type' FROM tblClients WHERE debt = 0;
SELECT name AS 'Client',debt AS 'Debtor Type' FROM tblClients WHERE debt BETWEEN 1 AND 1000;

我怎样才能把标签DEBTOR，LOW DEBTOR或者MEDIUM DEBTOR 在债务列而不是债务编号？

Answer 1

试试这个：

SELECT name AS Client, 
CASE 
    WHEN debt = 0 THEN 'Not Debtor'
    WHEN debt BETWEEN 1 AND 1000 THEN 'Low Debtor'
    ELSE 'Medium Debtor'
END AS debt
FROM tblClients