如何编写SQL查询以将两个表与映射表连接起来并获得格式化的输出(每个结果仅一行)? [英]How to write SQL Query to join two tables with mappings table and get formatted output with only one row per result?
如何在不使用辅助表的情况下联接两个只应在查询中一个表? (使用两列的左联接将起作用) [英]How can I join two tables that should be only one in a query without using auxiliary tables? (left join using two columns would work)