What is the function of the SELECT command in MySQL

Today, I will talk to you about the role of the SELECT command in MySQL, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

How to use the special features of the SELECT command in MySQL

1. Display the version of MYSQL

Mysql > selectversion (); +-+ | version () | +-- + | 6.0.4-alpha-community | +-+ 1rowinset (0.02sec)

two。 Show current time

Mysql > selectnow (); +-+ | now () | +-+ | 2009-09-1522 1rowinset 35 1rowinset (0.04sec)

3. Show year, month and day

SELECTDAYOFMONTH (CURRENT_DATE); +-- + | DAYOFMONTH (CURRENT_DATE) | +-- + | 15 | +-+ 1rowinset (0.01sec) SELECTMONTH (CURRENT_DATE) +-+ | MONTH (CURRENT_DATE) | +-+ | 9 | +-+ 1rowinset (0.00sec) SELECTYEAR (CURRENT_DATE) +-+ | YEAR (CURRENT_DATE) | +-+ | 2009 | +-+ 1rowinset (0.00sec)

How to use the special features of the SELECT command in MySQL

4. Display string

Mysql > SELECT "welecometomyblog!"; +-- + | welecometomyblog! | +-- + | welecometomyblog! | +-- + 1rowinset (0.00sec)

5. Used as a calculator

Select ((4) 4) / 10) + 25 (4) / 10) + 25 | (4 / 4) / 10) + 25 | +-- + 1rowinset (0.00sec)

6. Concatenated string

SelectCONCAT (f_name, ", l_name) ASNamefromemployee_datawheretitle='MarketingExecutive';+-+ | Name | +-+ | MonicaSehgal | | HalSimlai | | JosephIrvine | +-+ 3rowsinset (0.00sec)

Note: the CONCAT () function is used here to concatenate strings. In addition, we used the AS we learned before to give the result column 'CONCAT (f_name, ", l_name) a pseudonym.

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