CREATE INDEX [IF NOT EXISTS] index_name ON schema_name.table_name ( column_name ); 1. 例子: CREATE INDEX idx_vehiclestructured_recordid ON viid_vehicle.vehiclestructured (recordid); 1. (2) 创建指定索引类型。 CREATE INDEX IF NOT EXISTS index_name ON schema_name.table_name USING GIN ( ...
CREATE INDEX IF NOT EXISTS idx_emp_name ON emp (ename); -- 为ename字段创建索引 CREATE INDEX IF NOT EXISTS idx_emp_dept ON emp (deptno); -- 为deptno字段创建索引 -- 对于dept表 CREATE INDEX IF NOT EXISTS idx_dept_name ON dept (dname); -- 为dname字段创建索引 1. 2. 3. 4. 5. 6...
CREATE INDEX CONCURRENTLY ind_t_id_2 on t (id); 3. 关键字【IF NOT EXISTS】 #用该命令是用于确认索引名是否存在。若存在;也不会报错。 CREATE INDEX IF NOT EXISTS ind_t_id_3 on t (id); 4. 关键字【USING】 # 创建哪种类型的索引。 默认是B-tree。 CREATE INDEX ind_t_id_4 on t usin...
CREATE EXTENSION IF NOT EXISTS pg_bigm; CREATE EXTENSION pg_repack; -- 启用扩展 CREATE EXTENSION clickhouse_fdw; -- 创建数据库链接 CREATE SERVER clickhouse_svr FOREIGN DATA WRAPPER clickhouse_fdw OPTIONS(dbname 'default'); -- 用户映射 CREATE USER MAPPING FOR CURRENT_USER SERVER clickhouse_svr O...
它有以下几种创建方式: (1)创建索引:CREATE INDEX indexName ON tableName(tableColumns(length));如果是CHAR,VARCHAR类型,length...tableName ( [...], INDEX [indexName] (tableColumns(len...
select * into temp table tmp0 from xxx create index idx_tmp0_inner_cd on tmp0(inner_cd); 查看临时表是否创建，返回0表⽰未创建，1为创建 select count(*) from pg_class where relname = 'tmp0' 或者⽤下⾯，下⾯语句在pg和mysql中都适⽤ Create Table If Not Exists temp.MyTable...
.replaceAll("IF NOT EXISTS","") .replaceAll("TINYINT","SMALLINT") .replaceAll("DATETIME","TIMESTAMP") .replaceAll(", PRIMARY KEY \\(\"id\"\\)",""); // 如果存在表注释 if(createSQL.contains("COMMENT")) { createSQL = createSQL.substring(0, createSQL.indexOf("COMMENT")); ...
CREATE TABLE IF NOT EXISTS dictionary(english VARCHAR(30), chinese VARCHAR(80), times SMALLINT, in_new_words SMALLINT); # 插入数据 INSERT INTO dictionary(english, chinese, times, in_new_words) VALUES('hello', '你好', 0, 0); # 选择记录 ...
数据库在MySQL中,DATABASE 是一种模式对象,等同于Oracle、GaussDB(DWS)数据库的SCHEMA概念。DSC工具迁移时考虑了以下两个场景。 创建数据库输入示例 create database IF NOT EXISTS dbname1 CHARACTER 来自:帮助中心 查看更多 → GaussDB(DWS) SQL概述 什么是SQL SQL是用于访问和处理数据库的标准计算机语言。 SQL提供...
2023-07-02来自湖北 韩琦: 太棒了,我愿称之为史上最强mysql迁移到pgsql的教程,没有之一! 2023-07-05来自湖北 itemcf: Hello blogger, I see that your articles are all very good. Can you reprint the articles on your homepage to the OpenSNN open source community? I will mark the source and ...