[database] written interview database

Title Description
Write a SQL Query to fix the name , So that only the first character is capitalized , The rest are lowercase .
Topic link
Fix the name in the table
answer ：

select user_id,
CONCAT(Upper(left(name,1)),Lower(substr(name,2))) name 
from users 
order by user_id

explain
1.SQL Medium concat function

• Used to join two strings

select concat(first,second) as name from table_name;

2.left() function

• Extract multiple characters from the left side of the string ;

select row_name,left(row_name,2) as a from table_name

3.upper(s) Functions and ucase(s) function

• The string s All alphabetic characters in are converted to capital letters

4.lower(s) Functions and lcase(s) function

• The string s All alphabetic characters in are converted to lowercase letters

select upper(name) as name from table_name

5.substr(str,pos,len) function

• str from pos Position begins to intercept , Intercept len Characters

6.substr(str,pos)

• function str from pos From the beginning to the end

select substr(str,1) as name from table_name