Use CONCAT () function in MySQL, TRUNCATE () function to convert decimal to percentage

1. Use of CONCAT () function
CONCAT () function in mysql can combine multiple strings into one string

Example: select CONCAT ("vsrtdr", "farea", "qwer", "123")
 Result: vsrtdrfareaqwer123

Convert decimals to percentages:
 Example: select CONCAT (0.12 * 100, "%")
 Result: 12.00%

2. Use of TRUNCATE (x, y) function
The TRUNCATE (x, y) function can return the value x retained to the decimal point y

Example: select TRUNCATE (0.46557443,3)
 Result: 0.465

3. Then these two functions are used in combination to convert the decimal to a percentage

Example: select CONCAT (TRUNCATE (0.46557443 * 100,3), "%")
 Result: 46.557%

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