WHERE 子句中使用的列的 SELECT 顺序

Question

on question 13 of SQLZoo ( https://sqlzoo.net/wiki/SELECT_names ), I get an error if I change the order of the select from "SELECT capital, name" to "SELECT name, capital". Why does it matter?

SELECT capital, name
FROM world
WHERE capital LIKE concat('%', name , '%')

Answer 1

Hi jja, To clarify your question, the order of column names that you select do not matter here. It just picks the column name that you gave first and displays that column results first.

For example, The below select statement displays capital column followed by name.

SELECT capital, name FROM world

Similarly, the below SQL Query returns name column followed by capital.

SELECT name, capital FROM world

I ran the query you have submitted here and did not get any error. Try again and if you still encounter any error, share the error so that we can help.