Question

SQLite目标

我想从一个连接（或一系列连接/子查询）创建一个新表。我希望新表保留原始表中的数据类型以及唯一索引。

另外，我想重命名过程中的一些列。要在SQLite中执行此操作，我的印象是我需要执行以下步骤：

将联接表创建为临时表

使用所需的列名，数据类型和索引
创建一个空的新表
将临时表插入新表。

问题：是否有更好或更简洁的方法来完成此任务？

上述过程的代码示例：

--create joined table as tmp
DROP TABLE if exists tmp;

CREATE TABLE tmp AS
SELECT 
    individual_contributions.cmte_id, 
    cmte_pty_affiliation, 
    name, 
    employer, 
    transaction_dt,
    transaction_amt,
    file_num,
    cand_id,
    sub_id 
    FROM individual_contributions LEFT JOIN committee_master 
    ON individual_contributions.cmte_id=committee_master.cmte_id
    WHERE employer LIKE "Goldman Sachs"
    GROUP BY sub_id;

--create new table with desired specs
DROP TABLE if exists cm_indiv;

CREATE TABLE cm_indiv (
    cmte_id TEXT NOT NULL,
    cmte_pty_affiliation TEXT,
    contributor_name TEXT,
    contributor_employer TEXT,
    contributor_transaction_dt TEXT,
    cand_id TEXT,
    transaction_amt TEXT,
    file_num NUMERIC,
    sub_id NUMERIC NOT NULL
);

CREATE UNIQUE INDEX idx_cm_indiv ON cm_indiv (sub_id);

--insert joined table into new table
INSERT INTO cm_indiv (
    cmte_id,
    cmte_pty_affiliation,
    contributor_name,
    contributor_employer,
    contributor_transaction_dt,
    cand_id,
    transaction_amt,
    file_num,
    sub_id
    )
SELECT 
    cmte_id,
    cmte_pty_affiliation,
    name,
    employer,
    transaction_dt,
    cand_id,
    transaction_amt,
    file_num,
    sub_id
    FROM tmp;

Answer 1

这个CTAS使用SQL Fiddle（SQLite-WebSQL）为我工作。因此，在创建表时，请在select语句中使用首选列名，如下所示。

create table tbl( id int);

insert into tbl values (1);

create table new_tbl 
as 
select id as new_id 
from tbl;

select new_id from new_tbl;

Result: 
new_id
1

Answer 2

首先创建新表，然后直接插入已连接的数据：

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SQLite CREATE TABLE AS但重命名列并保留原始数据类型，键？

2 个答案: