c++stringinsert b=insert into h values（’“+a+”’）；这句什么意思

来源：蜘蛛抓取(WebSpider) 时间：2018-08-10 13:39 标签： insertvalues空格
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anti spam code below:SQL 关于insert into select from中where的用法_百度知道
SQL 关于insert into select from中where的用法
我想把a表里的所有记录复制到b表中去。前提是b中没有a中的这个记录的id，也就是说，如果b表中有了a表里的某条记录，就不再重复复制了。我写的SQL是insertintobselect*fromawherea.id!...
我想把a表里的所有记录复制到b表中去。前提是b中没有a中的这个记录的id，也就是说，如果b表中有了a表里的某条记录，就不再重复复制了。我写的SQL是insert into b select * from a where a.id!=b.id这个WHERE子句肯定不能这么写。但是我不知道应该怎么写了，麻烦赐教。。。。谢谢！
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INSERT INTO 语句用于向表格插入新行INSERT INTO 表名称 VALUES (值1, 值2,....)我指定所要插入数据列:INSERT INTO table_name (列1, 列2,...) VALUES (值1, 值2,....)
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这个语句的意思是：从一个表中通过条件查询出需要的数据之后插入到另外一张表中，进行存储。sql：insert
tablename2 (id)
as select id from tablename1 where id&5;解释：上面语句的意思就是从tablename1中读取出来id大于5的id字段，之后插入到tablename2表中（as字段可以省略）。备注：查询表中的字段结果必须与插入字段表字段类型一致。
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a.id not in (select id from b)
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feixianxxx
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feixianxxx
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标准的语法是这样的：insert into b select a.*from a join b on a.id&&b.
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insert into b select a.*from a join b on a.id=b.id and a.
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insert into b select * from a where not exists(select 1 from b where a.id=b.id)另外，not in的效率太低，劝楼主不要使用。
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insert into b select * from a where a.id not in(select id
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