Mysql錯誤：1222從兩個現有表創建新表時

Question

Mysql錯誤：1222從兩個現有表創建新表時。 這是我的sql語句，用於從兩個現有表創建新表。 請幫助我找到解決此問題的方法，謝謝

CREATE TABLE insurance_db.new_insurance 
SELECT * FROM insurance_db.auto_insurance
UNION all
SELECT * FROM insurance_db.home_insurance;  

Answer 1

試試這個

CREATE TABLE insurance_db.new_insurance 
As (SELECT col1, col2,.... FROM insurance_db.auto_insurance, insurance_db.home_insurance);

Answer 2

看來您試圖將SELECT與不同的列數結合在一起。

例如：

SELECT 1     -- one column
UNION ALL
SELECT 1, 2  -- two colums

導致此錯誤：

Error Code: 1222. The used SELECT statements have a different number of columns

嘗試對兩個選擇使用確定的columnt-list：

CREATE TABLE insurance_db.new_insurance 
SELECT
    col1, col2, col3 ...
FROM
    insurance_db.auto_insurance
UNION ALL
SELECT
    col1, col2, col3 ...
FROM
    insurance_db.home_insurance;