我在 PostgreSQL 中遇到语法错误问题。 我正在尝试添加一个查询，但它给了我一个错误

Question

I am taking a Data Analysis Course on Udemy. I am using PostgreSQL. On one of my exercises, I tried to add a column of data and recieved a Syntax Error Message. Here is a screen shot of my code:

can someone help with this?

Answer 1

What you're showing is a select statement

SELECT DISTINCT CustomerName, Region, Industry 
FROM sales
WHERE Region = 'West'

To add another criterion, use and as follows

SELECT DISTINCT CustomerName, Region, Industry 
FROM sales
WHERE Region = 'West'
 AND Industry = 'BusinessServices'

If you want to add a column to the table itself, proceed as follows

alter table sales add column Industry varchar