How to add multiple pieces of data in sql?

SQL method to add multiple pieces of data:

1. Add one record

insert into tableName(num1,num2,num3) values (1,2,3)

2. --Add multiple Records ①

insert into tableName(num1,num2,num3)   
select 3,4,5   
union all  //添加所有，包括重复项,使用union不添加重复项，最后一项不写union
select 6,7,8

3. --Add multiple records ②

insert into tableName (num1,num2,num3)
values
(1,2,3),
(4,3,4),
(1.23,9);

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