ORA-00936错误是Oracle数据库中的一个常见错误，它表示SQL查询中缺少了一个表达式。这通常是由于以下原因之一引起的：
错误示例：SELECT FROM table_name;
正确示例：SELECT column_name FROM table_name;
错误示例：SELECT * FROM table_name WHERE column_name;
正确示例：SELECT * FROM table_name WHERE column_name = ‘value’;
错误示例：INSERT INTO table_name VALUES ();
正确示例：INSERT INTO table_name (column1, column2) VALUES (value1, value2);
错误示例：UPDATE table_name SET WHERE column_name;
正确示例：UPDATE table_name SET column_name = ‘value’ WHERE condition;
错误示例：SELECT column_name FROM table_name GROUP BY;
正确示例：SELECT column_name FROM table_name GROUP BY column_name;
要解决ORA-00936错误，需要检查SQL查询语句中是否存在上述问题，并进行相应的修正。
