与to_char结合

Question

Write a SQL query to list FIRST_NAME, LAST_NAME, STATE and ZIP of Customers. STATE and ZIP should be displayed as STATE_ZIP (Ex: MO_65807)

select FIRST_NAME, LAST_NAME, concat(STATE,ZIP)state_zip
from customer;

It looks like that I have to combine state and zip within given specific form. (Ex: MO_65807). The query above shows that just combined with state, zip (Ex: MO65807). I think I need to use to_char in order to satisfy for the question. Is anybody know how to use those things at the same time?

Answer 1

在MYSQL中，您可以运行以下查询：

select FIRST_NAME, LAST_NAME, concat(STATE, '_', ZIP) as state_zip from customer;

Answer 2

您可以使用CONCAT或其他方式

select FIRST_NAME, LAST_NAME, STATE||'_'||ZIP as state_zip from customer;

Answer 3

Use the below script.

select FIRST_NAME, LAST_NAME, concat(concat(STATE,'_'),ZIP)state_zip
from customer;

OR

SELECT FIRST_NAME, LAST_NAME,STATE || '_' || ZIP AS state_zip
FROM customers;

Answer 4

there are two methods.

1. you can use DOUBLE PIPE(||) operator

   • state || '_' || zip

2. you can use concat inbuild function

   • concat(state,'_',zip)

Please note that if the data type are different for both columns then you have to convert both in common data type.