MySQL的bigint類型

bigint支持的數字的大小范圍為：19位，存電話號碼。有符號范圍：-9223372036854775808 到 9223372036854775807

int支持的數字范圍為：10位，有符號范圍：-2147483648 到 2147483647   無符號范圍：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)

插入一個大的數值並不報錯，但實際存到表里面的數據就是19位數字支持的最大數字

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>