SQL查询帮助（连接两个表）

Question

I have two tables in my database with the following schemas:我的数据库中有两个表，具有以下架构：

ratings table:
usedId
movieId
rating

info table
movieId
imdbId

The movieId values in each table are the same (ie movieId 1 is the same movie in both).每个表中的movieId 值是相同的（即movieId 1 在两个表中是同一部电影）。

Each movieId & userId appears multiple times in the ratings table.每个 movieId 和 userId 在评分表中出现多次。

What I am trying to do is create a new table that looks like:我想要做的是创建一个新表，看起来像：

new table:
userID
movieId
imdbId
rating

Where the imdbId is added for each row that matches the movieId of its original table.为与原始表的 movieId 匹配的每一行添加 imdbId 的位置。

Answer 1

select ratings.userID, ratings.movieId, info.imdbId, ratings.rating from
ratings inner join info on ratings.movieId = info.movieId

Answer 2

Or you can manual join the two tables:或者您可以手动连接两个表：

SELECT r.userID, r.movieId, i.imdbId, r.rating 
FROM ratings r, info i 
WHERE r.movieId = i.movieId

Answer 3

You should use SQL Join to create your expected table.您应该使用SQL Join创建您想要的表。

select Rating.userID, Rating.movieId, Info.imdbId, Rating.rating 
from ratings as Rating
inner join 
info as Info on ratings.movieId = info.movieId

To get more details of join check this inner join link要获取有关加入的更多详细信息，请查看此内部加入链接