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The SELECT List
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* | expression [AS output_name ] [, ]
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The SELECT list is the portion of the SELECT command between the SELECT and FROM keywords The SELECT list section lists the columns you want displayed in the result set The columns can all be from the same table, or they can be columns from multiple tables, preceded by the table name The asterisk is used to indicate that all columns in a table should be displayed in the output
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The AS option allows you to change the column heading label in the output to a value different from the column name For example:
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test=> select "CustomerID" as "ID", "LastName" as "Family", test-> "FirstName" as "Person" from store"Customer"; ID | Family | Person + + BLU004 | Blum | Jessica BLU001 | Blum | Rich BLU002 | Blum | Barbara BLU003 | Blum | Katie (4 rows) test=>
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Instead of the generic column names, the output display now shows the alternative column headings specified in the AS option
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The FROM Clause
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FROM from_list [,]
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Despite its innocent looks, the FROM clause can be the most complex part of the SELECT command, as the from_list parameter has several different formats all of its own Here are the different formats, each one on its own line:
[ONLY ] table_name [ * ] [ [ AS ] alias [ (column_alias [,] ) ] ] ( select ) [ AS ] alias [ (column_alias [,] ) ] function_name ( [argument [,] ]) [ AS ] alias [ (column_alias [,] | column_definition [,] ) ] function_name ( [ argument [,]) AS (column_definition [,] ) from_item [ NATURAL ] join_type from_item [ ON join_condition | USING (join_column [,]) ]
Just as with the SELECT command, it is easier to break the FROM clause options down one by one to discuss them
Standard Table Names
[ONLY ] table_name [ * ] [ [ AS ] alias [ (column_alias [,] ) ] ]
First, by now you should be familiar with most of the first line of parameters The table_name parameter specifies the tables to find the requested columns in The ONLY option directs PostgreSQL to search only the table specified, and not any tables that inherit the specified table (child tables, often created for partitioning, discussed in 1) An asterisk after the table name directs PostgreSQL to search all child tables of the specified table (this is the default behavior in PostgreSQL version 71 and later) As seen in
7:
Using Advanced SQL
6, the AS parameter allows you to define an alias for the table name that can be used anywhere within the SELECT command
The Sub-select
( select ) [ AS ] alias [ (column_alias [,] ) ]
The second format shows features that allow you to define a sub-query (called a subselect) to extract data from The sub-select is evaluated first, then the result set is used in the original select The result set from the sub-select acts as a temporary table, which is queried using the original SELECT command It is required that the sub-select be enclosed in parentheses and assigned an alias name You can optionally provide aliases to the result set columns for the sub-select:
test=> select * from (select "CustomerID", "FirstName" from store"Customer") test-> as test ("ID", "Name"); ID | Name + BLU004 | Jessica BLU001 | Rich BLU002 | Barbara BLU003 | Katie (4 rows) test=>
Functions
The next two formats describe the use for querying the result of a PostgreSQL function:
function_name ( [argument [,] ]) [ AS ] alias [ (column_alias [,] | column_definition [,] ) ] function_name ( [ argument [,]) AS (column_definition [,] )
The result set of the declared function is used as the input to the first SELECT command Just as with the sub-select, you must define an alias name for the function result set, and optionally declare column names for multicolumn function output The SELECT command queries the function output just as if it were a normal database table Using PostgreSQL functions is discussed in detail in 8
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