在PostgreSQL中进行复杂查询和连接表通常使用SQL语句来实现。以下是一些常见的方法：
SELECT *
FROM table1
INNER JOIN table2 ON table1.column_name = table2.column_name;
SELECT *
FROM table1
WHERE column_name IN (SELECT column_name FROM table2);
SELECT column1 FROM table1
UNION
SELECT column2 FROM table2;
WITH temp_table AS (
SELECT *
FROM table1
)
SELECT *
FROM temp_table
INNER JOIN table2 ON temp_table.column_name = table2.column_name;
SELECT *
FROM table1
WHERE EXISTS (
SELECT *
FROM table2
WHERE table1.column_name = table2.column_name
);
这些是一些常见的方法，您可以根据具体情况选择适合的方式来进行复杂查询和连接表。
