'||E'\n';ELSEv_table_ddl :=v_table_ddl||' '--note:two char spacer to start, to indent the column||'CONSTRAINT'||' '||'"'||v_constraint_record.constraint_name||'" '||v_constraint_record.constraint_definition||','||E'\n';ENDIF;END...
AI代码解释 drop table tf1;create tabletf1(c1 int,c2 int,c3varchar(32),c4varchar(32),c5 int);insert into tf1values(1,1000,'China','Dalian',23000);insert into tf1values(2,4000,'Janpan','Tokio',45000);insert into tf1values(3,1500,'China','Xian',25000);insert into tf1values(4,300,'...
In order to get the materialized view to be up to date, we need toREFRESHit, but for time-series use cases, a) you have to refresh it frequently for it to be up to date, and b) the refresh is inefficient because we have to delete and re-materialize all the data, maybe going bac...
In PostgreSQL, advanced concepts like table inheritance and function overloading are available. Working on Postgres is similar to its alternatives present in the market and it is rapidly growing to outshine them in the market. PostgreSQL has rich active community support and is well-maintained by ...
(0,99) s;-- convert device_logs into a distributed table without interrupting the applicationSELECTcreate_distributed_table_concurrently('device_logs','device_id', colocate_with :='devices');-- get the count of the logs, parallelized across shardsSELECTcount(*)FROMdevice_logs; ┌─────...
Adding Indexes to a Table Most of the tables that you have created so far have no indexes. An index serves two purposes. First, an index can be used to guarantee uniqueness. Second, an index provides quick access to data (in certain circumstances). Here is the definition of the customers...
For example, the table name is inserted into the query using format(). The comparison value for col1 is inserted using a USING parameter. Open a cursor that was bound to a query when the cursor was declared and that was declared to take arguments. DO $$ DECLARE c3 CURS...
typeThe type property of the dataset must be set toAzurePostgreSqlTableYes tableNameName of the tableNo (if "query" in activity source is specified) Example: JSON {"name":"AzurePostgreSqlDataset","properties": {"type":"AzurePostgreSqlTable","linkedServiceName": {"referenceName":"<AzurePostgre...
sqlprof:Generate SQL profile script from sqlarea/awr/spm/profile/plan_table/etc unwrap:Extract PL/SQL code or view from database into local file, if the code is encrypted, then auto-decrypt it Scripting ora:A command set that implement the scripting engine, to run predefined or customized sc...
INSERT INTO mytable VALUES('author', 'alice'); # psql 返回类似 INSERT 18732 1 # 查询插入是否成功: SELECT * FROM mytable; # 退出 psql : \q 5. 退出 # 退出 postgres 用户 exit # 退出 root 用户 exit [ 6. 如何关闭 PostgreSQL