SQL关联多张表的方法有以下几种：
SELECT *
FROM table1
INNER JOIN table2 ON table1.key = table2.key;
SELECT *
FROM table1
LEFT JOIN table2 ON table1.key = table2.key;
SELECT *
FROM table1
RIGHT JOIN table2 ON table1.key = table2.key;
SELECT *
FROM table1
FULL JOIN table2 ON table1.key = table2.key;
SELECT *
FROM table1
CROSS JOIN table2;
SELECT *
FROM table1 t1
INNER JOIN table1 t2 ON t1.key = t2.key;
以上是一些SQL中关联多张表的方法，选择合适的连接方式取决于查询需求和表之间的关系。
