SQL语句的正确写法取决于具体的查询或操作需求。以下是一些常见的SQL语句示例：
SELECT * FROM table_name;
SELECT column1, column2 FROM table_name;
SELECT * FROM table_name WHERE condition;
INSERT INTO table_name (column1, column2) VALUES (value1, value2);
UPDATE table_name SET column1 = value1, column2 = value2 WHERE condition;
DELETE FROM table_name WHERE condition;
SELECT table1.column1, table2.column2 FROM table1 INNER JOIN table2 ON table1.column3 = table2.column3;
请根据具体情况调整以上示例中的表名、字段名、条件和数值，以满足您的需求。建议在编写SQL语句时，先在数据库管理工具或在线SQL编辑器中测试，确保语法正确并且符合预期结果。
