select routine_catalog,routine_schema,routine_name,routine_type,created,last_altered,sql_mode from information_schema.routines where routine_name='test_procedure_group_by';
😶🌫️😶🌫️😶🌫️😶🌫️Take your time ! 😶🌫️😶🌫️😶🌫️😶🌫️…
类型注解
作用:相当于强类型语言中的类型声明
语法: (变量/函数): type
原始类型:
let bool: boolean true;
let num: number 313;
let str: string kaimo;数组:
let arr: number[] [1, 2, 3];
let arr2: Array<number | string> [1, 2,…