postgresql sample database with data

First, Introduction PostgreSQL provides a number of system management functions to view tables, indexes, table spaces, and the size of the database, described in detail below. second, the Database object dimension function The name of the function return type Describe Pg_column_size (Any) Int The number of bytes requi

database backup and recovery)Copy the data using the Copy command:E:\>pg_dump-u Postgres Testdb1>testdb14.sql The data is copied using the INSERT statement:E:\>pg_dump-u Postgres--column-inserts Testdb1>testdb15.sql 4. Migrating the CPOST database structure on PostgreSQL

bytesDouble precision 15-bit decimal digit Precision 8 bytes3. Arbitrary precision TypeThe use of numeric in PostgreSQL means that a type of arbitrary precision is a numeric value, denoted by numeric (m,n), where m is called precision and represents the total number of digits; n is known as the scale, which is the number of digits representing decimals. For example: 563.129 with a precision of 9 and a scale of 3Note: The valid range of values for num

tutorial, without encountering any problems. 2. In fact, this homework is very simple, but at the beginning I very blindly began to do homework, have not made clear the principle, encountered what attributes to convert what file and import into the database. Then the data were all erased, first understand tpc-h sql statements, with particular emphasis on the order in which statements are executed, beca

Deadline data cannot be imported into the postgresql database solution after statisticgathering is configured in deadline and saved to postgresql, slave and job information cannot be saved to postgresql during rendering tasks, and metadata. Wouldyouliketoadd is prompted when

To back up the database:pg_dump-h localhost-u root demo02 >/home/arno/dumps/demo02.bakTo recover a database:psql-h localhost-u root-d Demo Backup table:pg_dump-h localhost-u root demo02-t books >/home/arno/dumps/books.bakRecovery table:psql-h localhost-u root-d demo-t Books Psql Copy to/from usage:1. Need to log in to the database using Postgres Super User psql-u postgres-d demo022. Saved/Read folders need to give Postgres user permission to read and

PostgreSQL-based scalable, open-source Big Data cluster database: POSTGRES-XLhttp://www.postgres-xl.org/Postgres's-XL is a scale-out open source SQL database cluster based on the PostgreSQL database, with sufficient flexibility to

Label:When we use the PostgreSQL database, if a table is not constrained, it is likely that there will be several identical pieces of data, that is, duplicate data. As shown in the following:So what if we were to delete 2 of them? The first is that we can clear the contents of the table, and then insert the content int

PostgreSQL Advantage2016-10-20 21:36 686 People read comments (0) favorite reports Classification:MySQL Database (5)PostgreSQL is a free object-relational database server (database management system), which is very powerful. Includes support for the world's richest

SELECTT.* fromPerson, Jsonb_to_record (info) asT (numtext, nametext, scoretext)WHEREPerson.id=1;SELECTT.errmsg,sms_records.* fromSms_records, Jsonb_to_record (Result_json) asT (errmsgtextSidtext)SelectTb_result.errmsg,* from(SelectT1.*, T2.account_type,t2.account_name, T3.report_status,t3.errmsg,t3.user_receive_time,t3.description fromsms_records T1 Left JoinAccounts T2 ont1.account_id=t2.id Left Joinsms_status T3 onT1.sid=T3.SID) T, Jsonb_to_record (Result_json) asTb_result (errmsgtextSidte

There are many ways to do this, and the method used here is more secure. Then there will be time to add another method.The method is divided into three steps: Backing up data, creating a new table structure, importing dataBackup data: >>\copy table_name to '/home/bak/table_name.sql ';Create a new table structure: Copy the SQL statements from the original table structure, delete unnecessary and inappropriate

, indexing is 35% faster than indexing first When logging is not logged, indexing is slightly faster than indexing first, but not very different The fastest combination of insert data is:unlogged table + multithreaded Batch insert+ post-build index Guess:During the insert process, the time it takes to maintain the index is 35% to 40% of the total time, and it is mainly spent on log persistence. Other:At the same time, some other indicators i

PostgreSQL database data simple import and export Blog categories: DataBase Postgres Command operation:Data export: Pg_dump-u postgres (user name) (-t table name) database name (default with username) > C:\fulldb.sqlImport of dat