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Postgresql Create Table

# PostgreSQL Create Table PostgreSQL uses the CREATE TABLE statement to create a database table. ### Syntax The **CREATE TABLE** syntax is as follows: CREATE TABLE table_name( column1 datatype, column2 datatype, column3 datatype, ..... columnN datatype, PRIMARY KEY( one or more columns )); **CREATE TABLE** is a keyword that tells the database system to create a new table. The table name must be unique among other tables, sequences, indexes, views, or foreign tables within the same schema. **CREATE TABLE** creates a new empty table in the current database. The table will be owned by the user who issues this command. Each field in the table is defined with a data type, as shown below: ### Example The following creates a table named **COMPANY** with **ID** as the primary key. **NOT NULL** indicates that the field cannot contain **NULL** values: CREATE TABLE COMPANY( ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL, ADDRESS CHAR(50), SALARY REAL ); Next, we create another table that will be used in later chapters: CREATE TABLE DEPARTMENT( ID INT PRIMARY KEY NOT NULL, DEPT CHAR(50) NOT NULL, EMP_ID INT NOT NULL ); We can use the d command to check if the table was created successfully: tutorialdb=# d List of relations Schema | Name | Type | Owner --------+------------+-------+---------- public | company | table | postgres public | department | table | postgres (2 rows) Use d tablename to view table information: tutorialdb=# d company Table "public.company" Column | Type | Collation | Nullable | Default ---------+---------------+-----------+----------+--------- id | integer | | not null | name | text | | not null | age | integer | | not null | address | character(50) | | | salary | real | | | Indexes: "company_pkey" PRIMARY KEY, btree (id)
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