MySQL解析列以获取数字部分并将其添加

Question

我有下表：

+------------------+
|   ColumnName     |
+------------------+
| 1 Slap           |
+------------------+
| 13 Slap          |
+------------------+
| 2 Slap           |
+------------------+

只有MySQL如何解析ColumnName只能获取数值并将它们全部添加？

如果在上表中执行此操作，查询的输出应为16。

Answer 1

SELECT SUM(CAST(ColumnName as SIGNED)) FROM TableName

（如果您没有任何负数，则为UNSIGNED）

编辑：测试数据以满足怀疑论者。

mysql> select * from testtable;
+---------+
| testcol |
+---------+
| 1 Slap  |
| 13 Slap |
| 2 Slap  |
+---------+
3 rows in set (0.00 sec)

mysql> select sum(cast(testcol as unsigned)) from testtable;
+--------------------------------+
| sum(cast(testcol as unsigned)) |
+--------------------------------+
|                             16 |
+--------------------------------+
1 row in set, 3 warnings (0.00 sec)

mysql>

Answer 2

SELECT SUM(CAST(LEFT(ColumnName, INSTR(ColumnName, ' ')) as SIGNED))
FROM Table