How to work with tables

Hierarchical and Recursive Queries in SQL Server

Jasmin Ludolf

Content Developer

General SQL statements

General structure:

CREATE TABLE Person(

  ID INT NOT NULL,
  Name CHAR(32)
);

Data types:

Inserting data:

INSERT INTO ___ VALUES (___, ___);

INSERT INTO Person VALUES ('1', 'Smith');

Updating data:

UPDATE ___ 
    SET ___ = ___ 
    WHERE ___;

UPDATE Person 
    SET Name = 'Anderson' 
    WHERE ID = 1;

Delete the rows of a table:

DELETE FROM ___ 
    WHERE ___;

DELETE FROM Person 
    WHERE ID = 1;

Drop a table:

DROP TABLE ___

DROP TABLE Person

Add a column:

ALTER TABLE ___ 
    ADD ___ DATATYPE;

ALTER TABLE Person 
    ADD new DATATYPE;

Delete a column:

ALTER TABLE ___ 
    DROP COLUMN ___

ALTER TABLE Person 
    DROP COLUMN old

Hierarchical and Recursive Queries in SQL Server