sql - 从 SQLite 表中删除列

Question

我有一个问题:我需要从我的 SQLite 数据库中删除一列。我写了这个查询

alter table table_name drop column column_name 

但它不起作用。请帮助我。

Answer 1

更新:SQLite 2021-03-12 (3.35.0) 现在支持 DROP COLUMN。网站上的常见问题解答仍然过时。

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发件人:http://www.sqlite.org/faq.html :

(11) How do I add or delete columns from an existing table in SQLite.

SQLite has limited ALTER TABLE support that you can use to add a column to the end of a table or to change the name of a table. If you want to make more complex changes in the structure of a table, you will have to recreate the table. You can save existing data to a temporary table, drop the old table, create the new table, then copy the data back in from the temporary table.

For example, suppose you have a table named "t1" with columns names "a", "b", and "c" and that you want to delete column "c" from this table. The following steps illustrate how this could be done:

BEGIN TRANSACTION;
CREATE TEMPORARY TABLE t1_backup(a,b);
INSERT INTO t1_backup SELECT a,b FROM t1;
DROP TABLE t1;
CREATE TABLE t1(a,b);
INSERT INTO t1 SELECT a,b FROM t1_backup;
DROP TABLE t1_backup;
COMMIT;