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The empty privilege is the default for everyone on the system, which is the public group
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Granting privileges to roles is similar to using the ALTER ROLE command You can use the GRANT command to specify a role to be a member of another role:
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test2=# grant management to wilma; NOTICE: role "wilma" is already a member of role "management" GRANT ROLE test2=#
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To revoke privileges already granted, use the REVOKE SQL command You can revoke all assigned privileges on an object, or just a single assigned privilege for a single role:
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test2=# revoke update on store"Customer" from management; REVOKE test2=#
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Now that you have your tables created, your user Login and Group Roles created, and the proper privileges assigned, you probably want to start manipulating data in the database There are three SQL commands that are used for handling data in PostgreSQL: INSERT UPDATE DELETE The following sections describe these commands, and show how to use them in your application
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The INSERT command is used to insert new data into the table Each row of data in the table is called a record Sometimes in database books and publications you will see the term tuple, which is just a fancy way of saying record A record consists of a single instance of data for each column (although it is possible that one or more columns in a record can be empty, or null) If you think of the table as a spreadsheet, the columns are the table columns, and the rows are the individual table records The basic format of the INSERT command is
INSERT INTO table [(columnlist)] VALUES (valuelist)
6:
Using Basic SQL
By default, the INSERT command attempts to load values from the valuelist into each column in the table, in the order the columns appear in the table You can view the column order by using the \d meta-command To enter data into all columns, you use the following command:
test2=# insert into store"Customer" values ('BLU001', 'Blum', 'Rich', test2(# '123 Main St', 'Chicago', 'IL', '60633', '555-1234'); INSERT 0 1 test2=#
Notice that you can separate the INSERT command into separate lines The statement is not processed until the semicolon is entered The response from psql shows two values The first value is the object ID (OID) of the table record if the table was defined to use OIDs If not, then the value is zero The second value is the number of records that were entered into the table from the command If you do not want to enter all of the values into a record, you can use the optional columnlist parameter This specifies the columns (and the order) that the data values will be placed in:
test2=# insert into store"Customer" ("CustomerID", "LastName", "Phone") test2-# values ('BLU002', 'Blum', '555-4321'); INSERT 0 1 test2=#
Remember that the table constraints defined when creating the table apply, so you must enter data for columns created with the NOT NULL constraint If a column was created with a DEFAULT VALUE constraint, you can use the keyword DEFAULT in the valuelist to assign the default value to the column data You can also skip columns that have default values by not listing them in the columnlist parameter Those columns will automatically be assigned their default values
Modifying Data
If data entered into the table needs to be changed, all is not lost You can modify any data in the table, as long as your Login Role has UPDATE privileges for that table The UPDATE SQL command is used for updating data contained in tables The UPDATE command is another one of those commands that, while the idea is simple, can easily get complex The basic format of the UPDATE command is
UPDATE table SET column = value [WHERE condition]
The basic format of this command finds the specified column in the table and changes the data in that column to the value specified in the command However, using that basic format gets many database administrators into lots of trouble Here is the way the scenario usually plays out Suppose you want to go back to a data record previously inserted into the storeCustomer table, and add some data that might have been left
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