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## explain [鏈接](https://www.cnblogs.com/yycc/p/7338894.html)
聚合函數
數學
日期時間
year,month,day
period_diff,extract
to_days,unix_timestamp
字符串
concat_ws,concat
replace,insert
length,repeat
position,locate
正則
控制流
條件判斷
注意事項
附錄
常用函數
explain
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