我有一个像这样的选择查询:
SELECT
emp_des_company as 'Company',
(SELECT pav_des_valor FROM slt_pergunta_avaliacao pa, slt_avaliacao a WHERE pa.pav_idn_pergunta = 393 AND c.cas_idn_avaliacao = a.avl_idn_avaliacao)
FROM slt.case
...
我如何为这个子查询设置别名:
SELECT
emp_des_company as 'Company',
(SELECT pav_des_valor FROM slt_pergunta_avaliacao pa, slt_avaliacao a WHERE pa.pav_idn_pergunta = 393 AND c.cas_idn_avaliacao = a.avl_idn_avaliacao) as (SELECT per_des_descricao WHERE per_idn_pergunta = 393)
FROM slt.case
...
提前致谢。
最佳答案
您不能简单地在静态 SQL 中使用动态值作为列别名。
您必须使用固定值:AS column_name
一种替代方案是动态创建查询，请查看 prepared statements .
关于mysql - 从 select 内的子查询生成的别名字段，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37194651/