bigint支持的数字的大小范围为：19位，存电话号码。有符号范围：-9223372036854775808 到 9223372036854775807

int支持的数字范围为：10位，有符号范围：-2147483648 到 2147483647   无符号范围：0-4294967295

mysql> create table c5(id bigint);

Query OK, 0 rows affected (0.04 sec)

mysql> insert into c5 values(23434);

Query OK, 1 row affected (0.01 sec)

mysql> insert into c5 values(44444444444444423434);

Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into c5 values(444444444444444444444444444444444444444444423434);

Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into c5 values(444444444444444444444444444444444444444444423434444444444444444444444444444);

Query OK, 1 row affected, 1 warning (0.00 sec)

插入一个大的数值并不报错，但实际存到表里面的数据就是19位数字支持的最大数字

mysql> select * from c5;

+---------------------+

| id |

+---------------------+

| 23434 |

| 9223372036854775807 |

| 9223372036854775807 |

| 9223372036854775807 |

+---------------------+

4 rows in set (0.00 sec)

mysql> select count(*) from c5;

+----------+

| count(*) |

+----------+

| 4 |

+----------+

1 row in set (0.00 sec)

mysql> select count(*) from c5\G

*************************** 1. row ***************************

count(*): 4

1 row in set (0.00 sec)

mysql> select * from c5\G

*************************** 1. row ***************************

id: 23434

*************************** 2. row ***************************

id: 9223372036854775807

*************************** 3. row ***************************

id: 9223372036854775807

*************************** 4. row ***************************

id: 9223372036854775807

4 rows in set (0.00 sec)

mysql>