Explain Access Control Lists.
An ACL (Access Control List) is a list of permissions that is associated with an object. This list is the basis for MySQL server’s security model and it helps in…
What are all the Common SQL Function?
CONCAT(A, B) – Concatenates two string values to create a single string output. Often used to combine two or more fields into one single field. FORMAT(X, D) – Formats the…
What are the nonstandard string types?
Following are Non-Standard string types: TINYTEXT TEXT MEDIUMTEXT LONGTEXT
How many TRIGGERS are allowed in MySql table?
SIX triggers are allowed in MySql table. They are as follows: BEFORE INSERT AFTER INSERT BEFORE UPDATE AFTER UPDATE BEFORE DELETE and AFTER DELETE
What are the objects can be created using CREATE statement?
Following objects are created using CREATE statement: DATABASE EVENT FUNCTION INDEX PROCEDURE TABLE TRIGGER USER VIEW
What is the different between NOW() and CURRENT_DATE()?
NOW () command is used to show current year,month,date with hours,minutes and seconds. CURRENT_DATE() shows current year,month and date only.
How many columns can be used for creating Index?
Maximum of 16 indexed columns can be created for any standard table.
How to display top 50 rows?
In MySql, top 50 rows are displayed by using this following query: SELECT * FROM LIMIT 0,50;
How to enter Characters as HEX Numbers?
If you want to enter characters as HEX numbers, you can enter HEX numbers with single quotes and a prefix of (X), or just prefix HEX numbers with (Ox). A…
How MySQL Optimizes DISTINCT?
DISTINCT is converted to a GROUP BY on all columns and it will be combined with ORDER BY clause. SELECT DISTINCT t1.a FROM t1,t2 where t1.a=t2.a;