问在MariaDB列存储中插入INTO...SELECT问题EN存储在系统中的数据是数据库管理系统(DBMS)的核心,数据库...
INSERT SELECTSyntaxINSERT [LOW_PRIORITY | HIGH_PRIORITY] [IGNORE] [INTO] tbl_name [(col_name,...)] SELECT ... [ ON DUPLICATE KEY UPDATE col_name=expr, ... ] Contents Syntax Description See Also DescriptionWith INSERT ... SELECT, you can quickly insert many rows into a table from ...
select name,age from tb1 where age = 25; 1. 查出tb1表中age不等于28的数据。 select * from tb1 where age != 28; 1. 如下两条语句均表示从tb1表中查询出age大于等于25并且小于等于28的数据。 select * from tb1 where age >= 25 and age <=28; select name,age from tb1 where age betwe...
1.3 insert into select_statement insertintotbl_name select_statement语法是从其他表中检索数据,并将检索到的数据插入到表tbl_name中。要求tbl_name必须已经存在。 例如: insertintotselect10,'nan','longshuai5';insertintotselect11,'nan','longshuai6'fromdual;insertintotselect12,'nv','xiaofang6'unionsel...
select id,name,age from students; -- 使用as给字段起别名 select id,age as '年龄',high, gender from students; -- 通过表名字段查询 select students.id,students.name from students; -- 给表起别名查询 select s.id,s.name,s.age from students as s; --消除重复行 -- distinct select distin...
InnoDB:InnoDB是MariaDB的默认存储引擎,它支持ACID事务、安全恢复和行级锁定。...操作插入数据INSERT INTO mytable (name, age) VALUES ('Alice', 25);查询数据SELECT * FROM mytable WHERE age > 20;更新数据...通过这种方式,可以实现更高的高可用性和故障恢复能力。多源复制:多源复制允许一个从数据库...
这里我们要用到“insert into”命令。这条命令的格式是“insert into userInfo (字段1,字段2) values("值1","值2")”; 如图7所示 图7 8、查看表格中的数据:这里我们就以刚才的案例为例,查看一下刚才在“userInfo”数据库中插入的数据。这里我们要用到“select”命令,如图8所示...
MariaDB [aa]> create table aa as select * from cc; 把aa表数据插入到bb表(bb表存在) MariaDB [aa]> insert into bb select * from aa; 清空表 MariaDB [aa]> delete from cc; MariaDB [aa]> truncate table dd; 删除表中某个数据
我们将通过执行SELECT语句来执行此操作,如下所示: SELECT * FROM books; +---+---+---+---+ | BookID | Title | SeriesID | AuthorID | +---+---+---+---+ | 1 | The Fellowship of the Ring | 1 | 1 | | 2 | The Two Towers | 1 | 1 | | 3 | The Return of the King |...
其中,`permission1`、`permission2`等是要取消的权限(如`SELECT`、`INSERT`等),`database_name`是数据库名称,`table_name`是表名,`username`是要取消授权的用户名,`localhost`是用户的访问限制。 ## 17. 备份数据库 要备份数据库,可以使用以下命令: ...