Question

目前，我正在使用它，但它有点慢，我最终只有1331条记录。我认为必须有更快的方法来制作更多的记录？

CREATE TABLE IF NOT EXISTS util_nums (n integer primary key 
  autoincrement not null);

insert into util_nums values (0);

insert into util_nums(n) select null from (select 0 as n union select 1 
union select 2 union select 3 union select 4 union select 5 union select 6 
union select 7 union select 8 union select 9 union select 10) 
a cross join (select 0 as n union select 1 union select 2 union select 3 
union select 4 union select 5 union select 6 union select 7 union select 8 
union select 9 union select 10) b cross join (select 0 as n union select 1 
union select 2 union select 3 union select 4 union select 5 union select 6 
union select 7 union select 8 union select 9 union select 10) c;

我正在使用sqlite

Answer 1

创建包含所有数据的文件，然后从文件中批量插入表中。

See this

CREATE TABLE tmp_util_nums
(
 n int NOT NULL,

)
go

DECLARE @SQL varchar(max)
Declare @PathFileName varchar(max) 
SET @SQL = "BULK INSERT tmp_util_nums FROM '"+@PathFileName+"' WITH (FIELDTERMINATOR = ',') "

- 步骤2：执行BULK INSERT语句 EXEC（@SQL）

- 步骤3：将数据插入到最终表中 INSERT到util_nums SELECT * FROM tmp_util_nums

TRUNCATE TABLE  tmp_util_nums
go

Answer 2

我不确定它是否更快，但你可以尝试

--assuming table is empty, insert 2 records
insert into util_nums values (null);
insert into util_nums values (null); 

insert into util_nums 
select null from     
util_nums,util_nums,util_nums,util_nums,util_nums,
util_nums,util_nums,util_nums,util_nums,util_nums,
util_nums,util_nums,util_nums,util_nums,util_nums,
util_nums,util_nums,util_nums,util_nums,util_nums

它会插入2 ^ 20（如果您需要更多，只需将另一个util_nums添加到from）+ 2个记录，速度非常快。

SQL，如何为引用连接表创建大量记录？

2 个答案: