在 SQLite 中合并两个表

2021-12-17 00:00:00 join sqlite

我有两个表，ta 和 tb:

I have two tables, ta and tb:

他:

key col1  
--------
k1 a 
k2 c

待定:

key col2  
-------
k2 cc 
k3 ee

他们通过钥匙"连接.我想知道我怎样才能得到一张桌子，tc，比如:

They connected by "key". I want to know how can I get a table, tc, like:

key col1 col2  
-------------
k1 a  
k2 c cc 
k3  ee

有没有简单的方法而不是插入每条记录?它们是一百万条表记录，所以我需要一种有效的方法.

Is there a easy method instead of inserting every record? They are one million records of tables so I need an effective way.

推荐答案

Make a VIEW两张桌子.编写一个 SELECT ... JOIN 语句，为您提供所需的结果，然后将其用作 VIEW 的基础.

Make a VIEW of the two tables. Write a SELECT ... JOIN statement that gives you the result you want, and then use that as the base for a VIEW.

示例:

CREATE VIEW
  database.viewname
AS
  SELECT
    ta.key, 
    ta.col1,
    tb.col2
  FROM
    ta
   LEFT JOIN
    tb
   USING(key)

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