My_database=# EXPLAIN SELECT * FROM hw1_data Here is an example of the use of EXPLAIN on a simple query: Provide similar functionality to EXPLAIN, but the syntax is awkward.) SHOWPLAN and SET STATISTICS families of statements (EXPLAIN is not part of the SQL standard and does not appear in SQL Which produces a plain-text representation of the physical query plan. In SSMS, you can request that the estimated plan for a query beīy choosing the Query->Display Estimated Execution Plan menu item. You use the \d psql command: my_database=# \d hw1_data Through the tree view on the left side of the SSMS window.
In SQL Server Management Studio, you can view information about theĬolumns, constraints, and indices on a table Do this by right-clicking on the denied directory or file, and going to Properties=>Security=>Edit, and adding the postgres user.
WINDOWS USERS: If you are receiving errors such as ERROR: could not open file "C:\\Users\\username\\Downloads\\imdb2010\\actor-ascii.txt" for reading: Permission denied, you need to enable permissions for your postgres Windows user (which would be "postgres" if you used the default name when installing). The \copy psql command: my_database=# \copy hw1_data from 'hw1-data.txt' You can import data from a file on the client computer into an The filename: my_database=# \o Copying data from a file into a table
Query output and send it to your console again, use the same command,
Note that the SQL code of queries will not be saved to the file. (not in addition to) to your console with the \o psqlĬommand: my_database=# \o 'query_output.txt' You can send the output of queries to a file instead of The shell: > psql -U postgres -f "query.sql" my_database Saving query output to a file Written either by doubling the backslashes, as in 'D:\\subdir\\query.sql',Īlternatively, you can run psql with the query file directly from This means thatĪn absolute pathname like D:\subdir\query.sql must be Note that psql follows PostgreSQL in allowing backslash escape
Psql command: my_database=# \i 'query.sql' Running queries from an SQL fileĪs in SQL Server Management Studio, you can use psql to run SQL code Keys on the keyboard to move between previously entered lines, whichĮdit and resubmit. If you made a mistake while typing in a query, you can use the One window-ful at a time press Enter to go on to the next window, If the result table is too large to fit in the shell window, it will My_database=# CREATE TABLE hw1_data (name text, discount text, month text, price integer) To send the SQL statement to the server, end the statement with aĭepending on the command, psql will either respond with a confirmation To run an SQL statement, just type it in. As the message suggests, you exit psql by typing \q Statements which are sent to the database server, The line my_database=# is the prompt for SQL \g or terminate with semicolon to execute query Where my_database is the name of the database you want You can run psql by opening a Windows shell and typing > psql -U postgres my_database PostgreSQL wiki's list of GUI query tools. The Start->Programs menu under "PostgreSQL 8.4" on the Windows Lab Running queries, try pgAdmin III, located in Of SSMS however, psql is easy enough to use, provided you don't have (aka "SSMS" or "SqlWb") for SQL Server.) This command-line program doesn't have (This is equivalent to the SQL Server Management Studio Make sure to be consistent inĬase when naming a PostgreSQL database for example, if you ran createdbĪccess the database using the name CUSTOMER exactly, respecting case. Should only affect database names (since createdb is not an SQL However, PostgreSQL automatically lowercases all names given in SQL Note that, unlike SQL Server, PostgreSQL is case-sensitive when You can create a user with your login name, and then you don't need to use -U. Here -U denotes the user: in this case it is postgres.
Just as in SQL Server, your tables must be placed in a database.Ī database in PostgreSQL here we will describe how to create themĪs opposed to doing so from SQL code. Welcome to psql 8.4, the PostgreSQL interactive terminal.Įnter \q to quit the PostgreSQL shell.
Password you had specified during the installation. Here, postgres represents the username of
The CSEP544 shell launcher script willĪlso open a shell for you. You can get a command shell in Windows by running cmd.exe. The server and client tools are typically accessed from a command line. Unlike SQL Server, PostgreSQL is not usually used through a graphical
You need to either install postgres on your own computer (from ) or use the postgres installation in the Computer Labs in the basement of the CSE building. CSE P544: Using PostgreSQL Getting Started with PostgreSQL