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Insert Into select 与 Select Into 哪个更快？
1在平常数据库操作的时候，我们有时候会遇到表之间数据复制的情况，可能会用到INSERT INTO SELECT 或者 SELECT INTO ； 2 3那么二者语法上有什么区别？性能上又如何呢？ 4 5围绕着这两个问题，今天就来总结对比下： 6 class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;">
一：语法区别
1： INSERT INTO SELECT 的语法
1INSERT INTO SELECT 语句从一个表复制数据，然后把数据插入到一个已存在的表中。目标表中任何已存在的行都不会受影响。 2如果两个表的结构一致，字段类型一致： 3 4INSERT INTO table2 5SELECT * FROM table1; 6如果两个表结构不一致，只有某几列一致： 7 8INSERT INTO table2 (column_name) 9SELECT column_name FROM table1; 10 class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;">
2：SELECT INTO 的语法
1SELECT INTO 语句从一个表复制数据，然后把数据插入到另一个新表中。 2如果想要复制所有的列： 3 4SELECT * 5INTO newtable 6FROM table1; 7如果想要复制部分的列： 8 9SELECT column_name 10INTO newtable 11FROM table1; 12提示：新表将会使用 SELECT 语句中定义的列名称和类型进行创建。如果想要修改字段的名称，可以使用 AS 子句来应用新名称。 13 class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;">
二：性能区别
1----创建一个基础数据库 2CREATE TABLE TestDataTable( 3 id int not null, 4 userName varchar(20), 5 remark varchar(100) 6) 7----填充100W测试数据 8DECLARE @id INT,@userName NVARCHAR(50),@remark NVARCHAR(50); 9DECLARE @i INT; 10 11SET @id=0; 12SET @userName =''; 13SET @remark=''; 14SET @i=0; 15 16WHILE @i<1000000 17BEGIN 18 SET @id=@i; 19 IF(@i%2=0) 20 begin 21 set @userName='二狗子'; 22 set @remark='SELECT INTO 最快！' 23 end 24 else 25 begin 26 set @userName='李四'; 27 set @remark='快你妹，INSERT INTO 最快' 28 end 29 INSERT INTO TestDataTable(id,username,remark) 30 VALUES (@id,@username,@remark ) 31 SET @i=@i+1 32END 33 --查询填充后的数据 34SELECT * FROM TestDataTable --删除表结构以及数据【慎用】 35DROP Table TestDataTable 36 耗时1分钟58秒，数据填充好了，真是不给力，竟然用了快2分钟； 37 38 39 40好了，在去创建一个目标数据库； 41 42 43--创建一个目标数据库，把100W数据复制到这个里面取 44CREATE TABLE TargetDB( 45 id int not null, 46 userName varchar(20), 47 remark varchar(100) 48) 49测试1：INSERT INTO SELECT 50 51SET STATISTICS TIME ON 52INSERT INTO TargetDB 53SELECT * 54FROM TestDataTable 55GO 56SET STATISTICS TIME OFF 57 58 59 60 61 62 63测试2：SELECT INTO 64SET STATISTICS TIME ON 65SELECT * 66INTO TargetDB 67FROM TestDataTable 68GO 69SET STATISTICS TIME OFF 70 class="hljs-keyword" style="font-size: inherit; 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三：结论
经过上面的对比，可以看出SELECT INTO 的性能要比INSERT INTO 快出不少；
虽然SELECT INTO 数据的导入速度有很大优势，但是也有不好的地方，就是此语句只能在目标表没有创建的情况下使用，如果目标表结构已经存在，就会提示数据库中已存在名为 'TargetDB' 的对象（如下图），此时就只能用INSERT INTO SELECT 方式去操作了。
注意
1注意： 21：SELECT INTO FROM 3如果在sql/plus或者PL/SQL执行这条语句，会报"ORA-00905:缺失关键字"错误，原因是PL/Sql与T-SQL的区别。 4T-SQL中该句正常，但PL/SQL中解释是: 5select..into is part of PL/SQL language which means you have to use it inside a PL/SQL block. You can not use it in a SQL statement outside of PL/SQL. 6即不能单独作为一条sql语句执行，一般在PL/SQL程序块(block)中使用。 7 8如果想在PL/SQL中实现该功能，可使用Create table newTable as select * from ...： 9如： create table NewTable as select * from ATable; 10NewTable 除了没有键，其他的和ATable一样 112：一般oracle中如果是原表向复制数据修改年度使用时 select insert 配合 insert select; 12 如果时本表复制其他表数据 insert select 13 class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; 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line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-string" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #eedc70; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;"> class="hljs-keyword" style="font-size: inherit; line-height: inherit; margin: 0px; padding: 0px; color: #f82375; word-wrap: inherit !important; word-break: inherit !important;">
标签：insert,style,font,word,inherit,important,oracle,0px,select 来源： https://blog.51cto.com/xiaoshahai/2823983
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