本质上,我希望自动填充(fields_in_orig_table),而不必手动输入它们(有很多列,这会从表到表更改):
CREATE TABLE games_new LIKE games_orig;
ALTER TABLE games_new ADD COLUMN location varchar(256);
INSERT INTO games_new (fields_in_orig_table) SELECT * FROM games_orig;
RENAME TABLE games_orig TO games_old, games_new TO games_orig;
DROP TABLE games_old;
我的想法是:
CREATE TABLE games_new LIKE games_orig;
ALTER TABLE games_new ADD COLUMN version varchar(256);
INSERT INTO games_new
(SELECT CONCAT(GROUP_CONCAT(column_name ORDER BY ordinal_position
SEPARATOR " , "), " ") AS columns
FROM information_schema.columns
WHERE table_schema = 'games' AND table_name = 'games_orig' )
SELECT * FROM games_orig;
RENAME TABLE games_orig TO games_old, games_new TO games_orig;
DROP TABLE games_old;
这给了我语法错误(在Select concat ....附近)。
获取逗号分隔列列表的原始语法是:
SELECT CONCAT("'", GROUP_CONCAT(column_name ORDER BY ordinal_position SEPARATOR "', '"), "'") AS columns
FROM information_schema.columns
WHERE table_schema = 'db_name' AND table_name = 'tbl_name'
在我的查询中,我删除了额外的引号,因为我认为我的查询不需要引号作为列列表的一部分。
我在这里做错了什么?谁能提供帮助呢?
答案 0 :(得分:0)
INSERT INTO games_new
VALUES (SELECT CONCAT....
答案 1 :(得分:0)
在表格中插入值时,请使用INSERT INTO tablename VALUES (fields)
代替INSERT INTO tablename SET(fields)
。
CREATE TABLE games_new LIKE games_orig;
ALTER TABLE games_new ADD COLUMN version varchar(256);
INSERT INTO games_new
VALUES
(SELECT CONCAT(GROUP_CONCAT(column_name ORDER BY ordinal_position
SEPARATOR ' , '), ' ') AS columns
FROM information_schema.columns
WHERE table_schema = 'games' AND table_name = 'games_orig' )
SELECT * FROM games_orig;
RENAME TABLE games_orig TO games_old, games_new TO games_orig;
DROP TABLE games_old;
答案 2 :(得分:0)
您尚未指定要插入的列,因为嵌套查询仅返回1个值
INSERT INTO games_new (column_name_u_want_to_insert_value_into)
SELECT cast(concat(group_concat(column_name ORDER BY ordinal_position SEPARATOR " , "), " ") AS CHAR) AS columns
FROM information_schema.columns
WHERE table_name = 'games_orig';
另外,如果你一起运行所有语句,也要为插入查询添加分号(;)