經安全檢測,此網站為安全網站,請放心前往原始網址!

syntax - SQL left join vs multiple tables on FROM line? - Stack Overflow

Most SQL dialects accept both the following queries: SELECT a.foo, b.foo FROM a, b WHERE a.x = b.x SELECT a.foo, b.foo FROM a LEFT JOIN b ON a.x = b.x Now obviously when you need an outer join, the second syntax is required. But when doing an inner join .

stackoverflow.com

網址安全性掃描由 google 提供