如何将数据从另一表的一列拆分为三列?的SQL [英] How to split data from one column to three columns in another table? SQL

问题描述

我有带有两列id_student和hobbies的表(inf)，如下所示:

I have table (inf) with two columns id_student and hobbies like this:

ID_student =  1      
Hobbies =   "music, cooking, bassguitar" 

我想复制兴趣爱好，方法是将其拆分为包含以下各列的三列到另一个表(兴趣爱好):

and I want to copy the hobbies by splitting them to another table (hobbies) in three columns which contain the following columns:

ID_student   hobby1   hobby2     hobby3
1            music    cooking    bassguitar

我该如何在Postgres中写类似的东西?

how could I write something likethat in Postgres?

推荐答案

有很多方法可以做到这一点. 一种方法是使用 string_to_array 函数:

There is many ways to do this. One way is using the string_to_array function:

INSERT INTO hobbies (id, hobby1, hobby2, hobby3) 
SELECT id,hobbies_array[1],hobbies_array[2],hobbies_array[3] FROM 
  (
    SELECT id,string_to_array(hobbies,',') AS hobbies_array 
    FROM inf
  ) AS foo;

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