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应用场景
SHOW FUNCTIONS [ [ LIKE ] { function_name | regex_pattern }
function_name:函数名称。regex_pattern:需要过滤出函数名称的正则表达式。SHOW FUNCTIONSSHOW FUNCTIONS trim;SHOW FUNCTIONS LIKE 't*'SHOW FUNCTIONS LIKE 'yea*|windo*'SHOW FUNCTIONS LIKE 't[a-z][a-z][a-z]'
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