CONSTRAINT account_unique_pkey PRIMARY KEY (user_id) ) WITH ( OIDS = FALSE ) TABLESPACE pg_default; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 建两张同样表结构的表 AI检测代码解析 create unique index IX_account_unique_email on account_unique (email); alter table account_co...
CREATE[UNIQUE]INDEX[CONCURRENTLY][[IFNOTEXISTS]name]ON[ONLY]table_name[USINGmethod]({column_name|(expression)}[COLLATEcollation][opclass[(opclass_parameter=value[,...])]][ASC|DESC][NULLS{FIRST|LAST}][,...])[INCLUDE(column_name[,...])][WITH(storage_parameter[=value][,...])][TABLESP...
当在表列上定义PRIMARY KEY和UNIQUE约束时,MSSQL会自动创建这些索引。UNIQUE约束创建非聚集索引,而PRIMARY KEY则会创建聚集索引,除非已经存在一个。 What are the replication differences between PostgreSQL and SQL Server? Compare replication in PostgreSQL vs. MSSQL 中文:两种数据库的复制功能比较 遵循发布和订阅...
另一方面，MySQL 提供以下索引选项：存储在 R 树上的索引，例如在空间数据类型上找到的索引存储在 B 树上的索引，例如 PRIMARY KEY、INDEX、FULLTEXT 和 UNIQUE使用 FULLTEXT 索引时的倒排列表和哈希索引 安全 PostgreSQL和MySQL都支持组和用户管理，并为各种角色授予SQL权限。MySQL 支持本机窗口服务、PAM 和 LDAP ...
聚集索引根据键值(索引定义中的列)对表或视图中的数据行进行排序。一个表只能有一个聚集索引。非聚集索引存储在表数据之外,每个键值条目都有一个指向数据的指针。当在表列上定义PRIMARY KEY和UNIQUE约束时,MSSQL会自动创建这些索引。UNIQUE约束创建非聚集索引,而PRIMARY KEY则会创建聚集索引,除非已经存在一个。
Non_unique:0Key_name: PRIMARY Seq_in_index:1Column_name: id Collation: A Cardinality:4Sub_part: NULL Packed: NULL Null: Index_type: BTREE Comment: Index_comment:*** 2. row ***Table: tx Non_unique:1Key_name: tx_num_index Seq_in_index:1Column_name: num ...
Factors to consider when choosing between MySQL vs PostgreSQL Choosing an appropriate database management system is critical to your application’s performance, scalability, and dependability. When comparing MySQL versus PostgreSQL, several key factors come into play, each with unique implications for your...
INDEXPROPERTY function supports the following properties: IndexFillFactor, IndexID, IsClustered, IsDisabled, IsHypothetical, IsPadIndex, IsPageLockDisallowed, IsRowLockDisallowed, IsUnique. Babelfish for Aurora PostgreSQL 2.1 This release of Aurora Babelfish is provided with Aurora PostgreSQL 14.3 and 14.4...
This server is a perfect fit for data integrity and supports Primary Keys, Secondary Keys, UNIQUE, NOT NULL, EXPLICIT LOCKS, Advisory Locks, and Exclusion Constraints. Features of SQL Server The SQL server is characterized by its high-performance ability, especially in dealing with the great work...
主键索引:doris SSB提供的表DDL主键定义为Duplicate Key,不适用mysql与pgsql。且由于SSB数据中lineorder表主键有重复,不能使用唯一主键,因此mysql与pgsql主键索引均使用默认的INDEX,应都为B-Tree 索引。 表定义:mysql采用innodb引擎,pgsql采用缺省引擎;均不设置分区表。 表字段定义:唯一区别是int字段。由于pgsql不支...