Shulou(Shulou.com)06/01 Report--

The string based on SQL uses:

The string can be a character, number, or date in the SELECT list

However, dates and characters can only appear in single quotes. Whenever a line is returned, the string is output once

1. In the process of using the above, if you want to string the two columns together and add some custom display, the following figure:

Select first_name | |'is a'| | job_id as "Emp Details" from employees

2. How to show how much the salary of the first_name person is?

Select first_name | | 'his salary is' | | salary as "EMP SALARY" from employees

Second, the reference operator should follow the following principles:

1. Specify your own quotation mark separator

2. Select any delimiter

3. Increase readability and availability

The columns below will be more customized to make them more readable

For example, we want to show what the annual salary of first_name is.

Select first_name | | Q'['s ann-salary is:]'| | salary*12 as "emp salary" from employees

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