Question

我有这张桌子

CREATE TABLE Repondant
matricule CHAR(8) NOT NULL,         -- Roll
name VARCHAR(64) NOT NULL,
roll VARCHAR(64) NOT NULL,
email VARCHAR(80) NOT NULL,
CONSTRAINT Repondant_cc0 PRIMARY KEY (matricule),
CONSTRAINT Repondant_cc1 UNIQUE (courriel),
CONSTRAINT Repondant_matricule CHECK (matricule SIMILAR TO '[0-9]{8}'),
CONSTRAINT Repondant_nom CHECK (LENGTH(nom) > 0),
CONSTRAINT Repondant_prenom CHECK (LENGTH(prenom) > 0),
CONSTRAINT Repondant_courriel CHECK (
  LOWER(courriel) SIMILAR TO
    '[^][()<>:;@\,."[:space:][:cntrl:]]+(\.[^][()<>:;@\,."[:space:][:cntrl:]]+)*\@hotmail.com'
)
);

我想发出一个请求，告诉我表中所有同音异义词的名字，姓氏，电子邮件和滚动（同名和同名）

我试过

(SELECT name,lastname,role,email
FROM Repondant 
Where name = (SELECT name FROM Repondant GROUP BY nom HAVING COUNT(*)>1) AND                
lastname = (SELECT lastname FROM Repondant GROUP BY prenom HAVING COUNT(*)>1)

问题是，它没有给出同音异义词，它只给出了在表中至少有一次姓名和姓氏的人，但不是一起。

我应该如何找到同音异义词？

Answer 1

您可以构建一个数组来检查多个值的出现。例如，这是一个带子查询的变体：

SELECT * from repondant 
WHERE (name,lastname) in 
(
 SELECT  name,lastname 
 FROM repondant 
 GROUP BY name, lastname 
 HAVING count(array[name,lastname]) > 1
);

在postgresql中查找同音异义词

1 个答案: