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The concat( ) function add two or more expression together.
For add two or more expressions from column
Syntax -
Mon -
Sun 8.00 AM - 8.00 PM
Select Concat (expression1 , expression2 , expression3 , …………);
Syntax -
select concat ( column_name1, ' ', column_name2, ' ' , ……….. ) from table_name as fullname; 
The reverse function uses to write anything reversely.
Syntax -
select reverse ( ‘write any string’ );or
select reverse ( ‘write any string’ ) as reverse ;
This is used to count the length of words, numbers etc.
Syntax -
select char_length (‘ any character’);
This is used to write lower words to the upper word.
Syntax -
select upper (' any character ');
This is used to write lower words to upper word.
Syntax -
select lower (' any charecter ');
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