MySQL是一種流行的關系型數據庫管理系統，它提供了許多不同類型的子查詢，用于解決各種不同的查詢需求。以下是一些MySQL子查詢類型：

1. 標量子查詢
SELECT column_name FROM table_name WHERE column_name = (SELECT column_name FROM table_name WHERE condition);
2. 列子查詢
SELECT column_name FROM table_name WHERE column_name IN (SELECT column_name FROM table_name WHERE condition);
3. 行子查詢
SELECT column_name FROM table_name WHERE (column_name1, column_name2) = (SELECT column_name1, column_name2 FROM table_name WHERE condition);
4. 存在性子查詢
SELECT column_name FROM table_name WHERE EXISTS (SELECT * FROM table_name WHERE condition);
5. 非相關子查詢
SELECT column_name FROM table_name WHERE column_name = any (SELECT column_name FROM table_name WHERE condition);
6. 相關子查詢
SELECT column_name FROM table_name WHERE column_name = (SELECT column_name FROM table_name WHERE column_name = another_column_name);
7. 匯總子查詢
SELECT SUM(column_name) FROM table_name WHERE column_name >(SELECT AVG(column_name) FROM table_name WHERE condition);
8. 自連接子查詢
SELECT a.column_name1, b.column_name2 FROM table_name a, table_name b WHERE a.column_name1 = b.column_name1 AND a.column_name2 = (SELECT MAX(column_name2) FROM table_name WHERE column_name1 = a.column_name1);
9. 聯結子查詢
SELECT column_name FROM table_name1 WHERE column_name1 IN (SELECT column_name2 FROM table_name2 WHERE condition);

這些MySQL子查詢類型可用于解決不同的數據庫查詢需求，如搜索、過濾、匯總等。需要根據具體情況選擇使用哪種類型的子查詢。