You can create a new table by specifying the table name, along with all column names and their types:
CREATE TABLE weather ( city varchar(80), temp_lo int, -- low temperature temp_hi int, -- high temperature prcp real, -- precipitation date date );
You can enter this into
the line breaks.
psql will recognize
that the command is not terminated until the semicolon.
White space (i.e., spaces, tabs, and newlines) can be used
freely in SQL commands. That means you can type the command
aligned differently than above, or even all on one line. Two
--”) introduce comments. Whatever
follows them is ignored up to the end of the line. SQL is case
insensitive about key words and identifiers, except when
identifiers are double-quoted to preserve the case (not done
varchar(80) specifies a data type
that can store arbitrary character strings up to 80 characters in
int is the normal integer type.
real is a type for storing single
precision floating-point numbers.
should be self-explanatory. (Yes, the column of type
date is also named
date. This might be convenient or confusing
— you choose.)
PostgreSQL supports the
standard SQL types
as well as other types of general utility and a rich set of
geometric types. PostgreSQL can
be customized with an arbitrary number of user-defined data
types. Consequently, type names are not key words in the syntax,
except where required to support special cases in the
The second example will store cities and their associated geographical location:
CREATE TABLE cities ( name varchar(80), location point );
point type is an example of a
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