Если я попытаюсь добавить псевдоним к имени столбца при использовании sql concat вместе с HTML-тегами, произойдет сбой с ошибкой. Пожалуйста, найдите ниже детали.
1) Таблица CountryDtls
Id |CountryName |CityName |
---|------------|----------|
1 |India |Mumbai |
2 |India |Chennai |
3 |India |Bhopal |
4 |India |Indore |
5 |Aus |Sydney |
6 |Aus |Melbourne |
7 |USA |NY |
8 |USA |Chicago |
2) Рабочий запрос
SELECT
CONCAT("",
GROUP_CONCAT(
CONCAT("",CountryName,"<br/>"),
CONCAT("",CityName,"")
)
,"") AS html FROM CountryDtls;
3) Результат
<div><span>India</span><br/><span>Mumbai</span>,<span>India</span><br/><span>Chennai</span>,<span>India</span><br/><span>Bhopal</span>,<span>India</span><br/><span>Indore</span>,<span>Aus</span><br/><span>Sydney</span>,<span>Aus</span><br/><span>Melbourne</span>,<span>USA</span><br/><span>NY</span>,<span>USA</span><br/><span>Chicago</span></div>
4) Запрос с именем столбцапсевдоним
SELECT
CONCAT("",
GROUP_CONCAT(
CONCAT("",CountryName,"<br/>"),
CONCAT("",(CityName AS City),"")
)
,"") AS html FROM CountryDtls;
5) Ошибка отброшена
SQL Error [1064] [42000]: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AS City),"")
)
,"") AS html FROM CountryDtls' at line 5
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AS City),"")
)
,"") AS html FROM CountryDtls' at line 5