sql如下:insert into t_new select*from t order by id asc limit1;max_id=`psql -d db1 --no-align --tuples-only -c "select max(id) from t_new ;"`echo"当前时间: $(date +%F_%T)"|tee-a/tmp/archive.log echo"当前最大id:"${max_id}|tee-a/tmp/archive.logletmax_id=max_id+1...
PostgreSQL 使用DROP TABLE 语句来删除表格,包含表格数据、规则、触发器等,所以删除表格要慎重,删除后所有信息就消失了。 语法 DROP TABLE 语法格式如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 DROP TABLE table_name; 实例 上一章节中我们创建了 COMPANY 和 DEPARTMENT 两个表格,我们可以先使用 \d...
PostgreSQL 删除表格 PostgreSQL 使用 DROP TABLE 语句来删除表格,包含表格数据、规则、触发器等,所以删除表格要慎重,删除后所有信息就消失了。 语法 DROP TABLE 语法格式如下: DROP TABLE table_name; 实例 上一章节中我们创建了 COMPANY 和 DEPARTMENT 两个表格,我们可以先使用 \d 命令来查看表格是否创建成功: shu...
Example: Dropping a Tablespace in Postgres Consider the following queries to drop a tablespace. First of all, we will create a tablespace named “tablespace”. CREATETABLESPACEtablespaceLOCATION'C:\Program Files\PostgreSQL\15\data'; This will successfully create a tablespace. The next step is to c...
PostgreSQL 执行Drop Table等命令型SQL的总体流程,DROP命令(Commands)实现:/**Droponeormoreobjects.**Wedon'tcurrentlyhandleallobjecttypeshere.Relations,forexample,*requirespecialhandling,because(forexample)indexeshaveaddit
Introduction to PostgreSQL DROP TABLESPACE statement The DROP TABLESPACE statement delete a tablespace from a database: Here’s the syntax of the DROP TABLE statement: DROP TABLESPACE [IF EXISTS] tablespace_name; In this syntax: First, specify the name of the tablespace that you want to remove ...
do $$declarer record;beginforrin(selecttablenamefrompg_tableswhereschemaname='my-schema-name')loopexecute'drop table if exists'||quote_ident(r.tablename)||'cascade';endloop;end$$; This query works by listing out all the tables in the given schema and then executing adrop tablefor each (...
PostgreSQL 13.1 手册 一、 管理操作 1.数据库对象Size查询 2.恢释放磁盘空间 VACUUM regclass; --释放具体的表(不会给操作系统,不会减少磁盘使用量) VACUUM FULL regclass;–立即释放磁盘空间给操作系统(可能锁表) 3.数据库锁表 查找所有活动的被锁的表 ...
The result is a valid, but empty table. Tip:TRUNCATEis aPostgreSQL extension that provides a faster mechanism to remove all rows from a table. By default,DELETEwill delete rows in the specified table and all its child tables. If you wish to delete only from the specific table mentioned, ...
参考https://www.postgresql.org/do... WITH provides a way to write auxiliary statements for use in a larger query. These statements, which are often referred to as Common Table Expressions or CTEs, can be thought of as defining temporary tables that exist just for one query. WITH提供了一种...