>create table index5(id int, name VARCHAR(20), sex BOOLEAN, INDEX index5_ns(name,sex), ); 在已经存在的表上创建索引 >CREATE [UNIQUE|FULLTEXT|SPATIAL] INDEX 索引名 ON 表名 (属性名 [(长度)] [ASC|DESC]); 用ALTER TABLE语句创建索引 >ALTER TABLE 表名 ADD [UNIQUE|FULLTEXT|SPATIAL] IND...
MariaDB [(none)]> create user ann@localhost identified by 'ann' # 创建用户‘Jack’ MariaDB [mysql]> create user jack@'192.168.13.34' identified by 'jack'; 1. 2. 3. 4. 5. 6. 2.MariaDB数据库给用户授权 2.1 命令 GRANT privileges ON databasename.tablename TO 'username'@'host' 1. ...
CREATE TABLE b(for_key INT REFERENCES a(not_key)); From MariaDB 10.5, MariaDB will attempt to apply the constraint. See Foreign Keys examples. Each definition either creates a column in the table or specifies and index or constraint on one or more columns. See Indexes below for details...
MariaDB has a dedicated VECTOR(N) data type with a built-in data validation. N is the number of dimensions that all vector values in the column will have. For example,CREATE TABLE embeddings ( doc_id BIGINT UNSIGNED PRIMARY KEY, embedding VECTOR(1536) ); ...
一、数据库管理语句 1、Syntax: CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] db_name [create_specification] ... create_specification: [DEFAULT] CHARACTER SET [=] ch
3. CREATE TABLE ... SELECT 命令在基于行模式复制和基于命令模式复制 为使CREATE TABLE ... SELECT 命令在基于行模式复制和基于命令模式复制的情况下都能正常工作,MariaDB 中的 CREATE TABLE ... SELECT 命令在从库上将会被转化为 CREATE OR RPLACE 命令执行,好处是即使从库中途宕机恢复后仍然能够正常工作。
and LIMIT四、MariaDB 10.3 解决掉了UPDATE不支持同一张表的子查询更新案例：CREATE TABLE t1 (c1 INT, c2 INT);INSERT INTO t1 VALUES (10,10), (20,20);UPDATE t1 SET c1=c1+1 WHERE c2=(SELECT MAX(c2) FROM t1);MySQL 8.0 直接报错：ERROR 1093 (HY000): You can't specify target table ...
ALTER TABLE tbl_name [WAIT n|NOWAIT] ... CREATE ... INDEX ON tbl_name (index_col_name, ...) [WAIT n|NOWAIT] ... DROP INDEX ... [WAIT n|NOWAIT] DROP TABLE tbl_name [WAIT n|NOWAIT] ... LOCK TABLE ... [WAIT n|NOWAIT] ...
create table wuhan.t1 ( x int ) with system versioning; 在mariadb中简化的语法中不会创建额外的列,并且不会混淆select * from t的输出,版本信息仍会存储在, 我们可以通过伪劣直接访问版本信息: mariadb [wuhan]> insert into wuhan.t1(x)values(1); ...
首先,MySQL从数据表中查询数据的基本语句为SELECT语句,SELECT语句的基本格式如下: MariaDB [none]> SELECT [predicate] { * | table.* |...= 不等于 < 小于 <= 小于或等于 > 大于 >= 大于或等于 BETWEEN 位于两值之间 实例1: 查...