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Description Display string on the standard output Execute commands from the specified file Redirect all query output to the specified file Write string to the output specified in the \o command
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Table 5-5 psql Input/Output Meta-commands
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The commands entered in the testsql file were processed by psql, and the output was displayed on the console Notice that the commands themselves were not displayed in the output This is where the \echo command comes in handy to help produce nice titles for the displayed data
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Informational Meta-commands
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The psql informational meta-commands provide a wealth of information about the PostgreSQL system You can use the informational meta-commands to display the tables, views, and users created in the connected database These commands are listed and described in Table 5-6
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Command \d name \da [pattern] \db [pattern] \dc [pattern] \dC \dd [pattern] \dD [pattern] \df [pattern] \dg [pattern] \di [pattern] \dn [pattern] \do [pattern] \dl [pattern] \dp [pattern] \ds [pattern] \dS [pattern] \dt [pattern] \dT [pattern] \du [pattern] \dv [pattern] \l \z [pattern]
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Description Display detailed information about the table, index, sequence, or view name List aggregate functions matching pattern List tablespaces matching pattern List conversions matching pattern List casts Show comments for objects matching pattern List domains matching pattern List functions matching pattern List Group Roles matching pattern List indexes matching pattern List schemas matching pattern List operators matching pattern List large objects matching pattern List table, view, and sequence access privileges matching pattern List sequences matching pattern List system tables matching pattern List tables matching pattern List data types matching pattern List users matching pattern List views matching pattern List all databases List table, view, and sequence access privileges matching pattern
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Table 5-6 psql Informational Meta-commands
PostgreSQL 8 for Windows
As you can see from Table 5-5, there are lots of informational meta-commands available for you These are great tools for viewing the layout of a PostgreSQL database Be careful when using these commands, though, as the information they produce is dependant on your schema search path (described in detail in 6) By default, the \dt command displays a list of tables in the schemas contained in your search path If you want to display the tables from a schema not in your search path, you must specify it within the option pattern:
test=> \dt store List of relations Schema | Name | Type | Owner + + + store | Customer | table | postgres store | Order | table | postgres store | Product | table | postgres (3 rows) test=>
The period at the end of the schema name is important A very useful meta-command is the \d command This meta-command allows you to view the columns available within a table:
test=> \d store"Customer" Table "storeCustomer" Column | Type | Modifiers + + CustomerID | character varying | not null LastName | character varying | FirstName | character varying | Address | character varying | City | character varying | State | character(2) | Zip | character(5) | Phone | character(8) | Indexes: "CustomerKey" PRIMARY KEY, btree ("CustomerID") test=>
Notice that all of the information related to the table is displayed, including any indexes created For a quick look at what Group Roles a Login Role belongs to, the \dg metacommand is handy:
5:
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test=>\dg fred List of roles Role name | Superuser | Create role | Create DB | Connections | Member of + + + + + fred | no | no | no | no limit | {Accountant} (1 row) test=>
This output tells you what database privileges the Login Role has, as well as what Group Roles it is a member of
Formatting Meta-commands
The formatting meta-commands control how table data is displayed in psql These commands control the format of the table output when displaying the results from queries The formatting meta-commands are listed and described in Table 5-7 You should have noticed by now that in the normal query output, the table column names are displayed, followed by the record data, each record being on one row, immediately followed by the data for the next record These meta-commands allow you to change the way the data is displayed For starters, if you want to see only the data rows, without the column headings, use the \t meta-command If you would like to create a special title for the table, use the \C metacommand If you do not even want the data displayed in a table format, use the \a metacommand This outputs only the table headings and data, without the table formatting
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