How does mysql remove the first character

This article introduces the knowledge of "how to remove the first character from mysql". In the operation of practical cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Methods: 1, the use of right function, syntax for "update table name set specified field = right (specified field, length (specified field)-1)."; 2, the use of substring function, the syntax is "select substring (specified field, 2)."

The operating environment of this tutorial: windows10 system, mysql8.0.22 version, Dell G3 computer.

How does mysql remove the first character?

MySQL string interception related functions:

1. Intercept the string from the right

Right (str, length)

Description: right (intercepted field, intercepted length)

Example:

Select right (content,200) as abstract from my_content_t

Remove the first character of the specified field. "

Update table name set specified field = right (specified field, length (specified field)-1) WHERE specified field like'"%'

2. Intercept the string

Substring (str, pos) substring (str, pos, length)

Description: substring (intercepted field, which bit to intercept)

Substring (intercepted field, which bit to intercept, intercept length)

Example:

Select substring (content,5) as abstract from my_content_tselect substring (content,5200) as abstract from my_content_t

(note: if the number of digits is negative, such as-5, it is the length from the last digit to the end of the string or truncated.)

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