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JSON_ Incorrect problem returned by extract

2022-07-22 17:07:00 【henulmh】

json_extract The function is used to directly fetch json value , Return value with double quotation marks
json_unquote The function is used to remove double quotation marks .

Example ：
Insert picture description here

sql Medium substr function ：
SUBSTR(str, beg, len)
Represents the string str From beg Characters start with a length of len Substring of
Be careful beg from 1 Start ！, instead of 0

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