使用 DELETE 语句删除数据。

    示例如下：

    1. 假设有如下所示数据的表 t1。

      1. obclient> CREATE TABLE t1(c1 int primary key, c2 int);
      2. Query OK, 0 rows affected (0.16 sec)
      3. obclient> INSERT INTO t1 VALUES(1,1),(2,2),(3,3),(4,4);
      4. Query OK, 4 rows affected (0.01 sec)
      5. Records: 4  Duplicates: 0  Warnings: 0
      6. obclient> SELECT * FROM t1;
      7. +----+------+
      8. | c1 | c2   |
      9. +----+------+
      10. |  1 |    1 |
      11. |  2 |    2 |
      12. |  3 |    3 |
      13. |  4 |    4 |
      14. +----+------+
      15. 4 rows in set (0.06 sec)

    2. 删除 c1=2 的行。

    1. obclient> DELETE FROM t1 WHERE c1 = 2;
    2. Query OK, 1 row affected (0.02 sec)
    4. obclient> SELECT * FROM t1;
    5. +----+------+
    6. | c1 | c2   |
    7. +----+------+
    8. |  1 |    1 |
    9. |  3 |    3 |
    10. |  4 |    4 |
    11. +----+------+
    12. 3 rows in set (0.01 sec)

    更多 DELETE 语句相关的语法说明请参见《SQL 参考（Oracle 模式）》中 DELETE 章节。