(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | ALTER TABLE. The SQL ALTER TABLE command is used to add, delete or modify columns in an existing table. You should also use the ALTER TABLE command to add and drop various constraints on …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | Indexes. Indexes are special lookup tables that the database search engine can use to speed up data retrieval. Simply put, an index is a pointer to data in a table. An index in a …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | Alias Syntax. You can rename a table or a column temporarily by giving another name known as Alias. The use of table aliases is to rename a table in a specific SQL statement. …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | NULL Values. The SQL NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank. A field with …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | EXCEPT Clause. The SQL EXCEPT clause/operator is used to combine two SELECT statements and returns rows from the first SELECT statement that are not returned by the second SELECT statement. This means EXCEPT returns only …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | NTERSECT Clause. The SQL INTERSECT clause/operator is used to combine two SELECT statements, but returns rows only from the first SELECT statement that are identical to a row in the second SELECT statement. This …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | UNIONS CLAUSE. The SQL UNION clause/operator is used to combine the results of two or more SELECT statements without returning any duplicate rows. To use this UNION clause, each SELECT statement must …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | CARTESIAN or CROSS JOINS. The CARTESIAN JOIN or CROSS JOIN returns the Cartesian product of the sets of records from two or more joined tables. Thus, it equates to an inner join …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | SELF JOINS. The SQL SELF JOIN is used to join a table to itself as if the table were two tables; temporarily renaming at least one table in the SQL statement. Syntax The basic …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | FULL JOINS. The SQL FULL JOIN combines the results of both left and right outer joins. The joined table will contain all records from both the tables and fill in NULLs for missing matches …