SQL (Structured Query Language) – Handling Duplicates
There may be a situation when you have multiple duplicate records in a table. While fetching such records, it makes more sense to fetch only …
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SQL (Structured Query Language) – Using Sequences
A sequence is a set of integers 1, 2, 3, … that are generated in order on demand. Sequences are frequently used in databases because …
SQL (Structured Query Language) – Sub Queries
A Subquery or Inner query or a Nested query is a query within another SQL query and embedded within the WHERE clause. A subquery is …
SQL (Structured Query Language) – Clone Tables
There may be a situation when you need an exact copy of a table and the CREATE TABLE … or the SELECT… commands does not …
SQL (Structured Query Language) – Temporary Tables
What are Temporary Tables? There are RDBMS, which support temporary tables. Temporary Tables are a great feature that lets you store and process intermediate results by using …
SQL (Structured Query Language) – Date Functions
The following table has a list of all the important Date and Time related functions available through SQL. There are various other functions supported …
SQL (Structured Query Language) – Wildcard Operators
We have already discussed about the SQL LIKE operator, which is used to compare a value to similar values using the wildcard operators. SQL supports …
