ONLINE EDUCATION

Tips: Below Few Tips to be follow for candidates who want to purse career in this relevant domain.  1)   CRUD stands for create,read,update and delete are essential for database operation,adminstrative and development work. Please master these techniques like window functions, stored procedures and triggers concept will impress employers. By enhancing these skills, it helps you in optimizing complex data retrieval process and data manipulation. 2)   Please learn the scripting language like python or UNIX/Linux shell scripting to automate tasks and build data pipelines to improve your efficiency in showing automation skills to the demand market. 3)  Communication skills is an essential to understand the business needs and help to build sql queries according to their requirements. Please explain the technical things into non-technical things to businesspersons. This helps you to understand the business about your technical and innovative skills. 4) Please update related to the cloud-base

 " Most important question asked in oracle sql plsql interview" Introduction: Delete and Truncate is used to remove the data from the relational table. SQL developer have to decide where to use these both concepts. By understanding the concept, it is useful for handling the data. Well analysis of all the rows to be deleted before using truncate command. Difference: Delete Truncate It is a Data Manipulation Language command. It is a Data Definition Language command. Syntax: Delete from tablename where condition; Delete from tablename; Syntax: Truncate table tablename; Delete command is slower than truncate. Truncate command is faster. Delete contain the where clause. Truncate don’t contain the where clause. It is used to remove or delete the specified row or tuple from the table using where clause. In absence of where clause, it i

 "T his is an excepted question in an SQL Developer interview. " Introduction: Key play an important role in data integrity and an efficient access to the records in the relational databases. It is used to prevent the data from being duplicated. It maintains the reliable relationship between the tables. There are several types of keys which are below listed: Primary Key Candidate Key Super Key Foreign Key Unique Key Alternate Key Primary Key: It is applied on the columns of the table which helps in identifying each row or tuple uniquely. It enforces integrity constraint on the table. Only one primary key is applied in a table. It does not accept any null and duplicate values. It does not accept null and duplicate values. It's value is rarely changed in a table. Primary key in one table can acts as foreign key in another table. Let us understand the concept with the help of student table example. create table student (roll_no int not null,sname varchar2(15),dept_name varch

 " Infosys interview question has been asked. " DIFFERENCE: SIMPLE INDEX COMPOSITE INDEX If the index is created only one field of the table is called as simple index. If the index is created more than one field of the table is called as composite index. Only one entry is created in the simple index. Multiple entries are created in the composite index. It is also called as single column index. It is also called as multiple column index. It is composed of single columns. It is composed of multiple columns. Data which is accessed by the single variable. Data which is accessed by the multiple variables. Syntax: create index index_name on table_name(column_name); Syntax: create index index_name on table_name(column_name1,column_name2); Example: create index si on emp(empno); Example

  "It is an important question which is asked in an interview as indexing topic." INTRODUCTION: In the SQL server, primary key constraint automatically builds the clustered index on the column. There will be only one clustered index per table. It is used to sort the data of the table alphabetically as like dictionary structure. Single table can contain multiple non-clustered indexes. It collects the data and record at one place simultaneously. CLUSTERED INDEX: It is the kind of the special type of index which reorders the ways that the records of data of the table are physically stored to match with an index. Whenever the primary key constraint is created on the table, database engine by auto creates the clustered index. View or data are sorted based on the key and values. It stores the data permanently on the disk. It is created only when both the below conditions are satisfied: Moved data or file in the secondary memory should be sequential and properly sorted fashion. Key

 "It is the accepted question in oracle SQL and plsql interview question." INTRODUCTION: Subqueries can be classified into the two parts i.e. Correlated and non-correlated subquery. In both mention subquery, there is the combination of outer and inner query. Same select statement are used for both the sub-queries. Execution of the sub query can include from and where clause, group by, having and order by clause. It contains the select statement inside the another select statement. It is used with the update and delete statements. Correlated subquery is also called as the simple subquery. Not frequently, both subqueries type is providing the same results. Subquery is also called as the nested query. SQL query is divided into two parts i.e. inner subquery and outer subquery. Outer query is called as the parent query. Inner query is called as the child query. Subqueries can be defined as the query which is nested in the other query. Subquery can be used to update the database by