VLOOKUP等效於MySQL

Question

我有兩個表：operations與客戶端處理數據和customers與年齡數據。我想創建新表，vlookup和customers添加新列Age到operations，但它亙古不變的工作：

CREATE TABLE new_schema.total AS (
    SELECT new_schema.operations.Id_check,new_schema.operations.ID_client, new_schema.customers.Age 
    INNER JOIN Age ON new_schema.operations.ID_client=new_schema.customers.ID_client 
); 

Answer 1

你有一些基本的語法錯誤。沒有FROM子句指定第一個表，並且INNER JOIN後面必須跟隨您加入的表，而不是列。

而你說你想要新的表格命名爲vlookup，但你創建了total。

CREATE TABLE new_schema.vlookup AS (
    SELECT o.id_check, o.id_client, c.age 
    FROM new_schema.operations AS o 
    INNER JOIN new_schema.customers AS c ON o.id_client = c.id_client 
);