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What is SQL
Structured Query Language or SQL is a standard language for storing, manipulating and retrieving data in databases.SQL is used to communicate with a database.
Our SQL Homework Expert will help you to write SQL query in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, MongoDB, and other database systems.
According to ANSI (American National Standards Institute), it is the standard language for relational database management systems. SQL statements are used to perform tasks such as update data on a database, or retrieve data from a database.
The standard SQL commands such as Select, Insert, Update, Delete, Create, and Drop can be used to accomplish almost everything that one needs to do with a database.
What Can SQL do?
SQL can execute queries against a database
SQL can retrieve data from a database
SQL can insert records in a database
SQL can update records in a database
SQL can delete records from a database
SQL can create new databases
SQL can create new tables in a database
SQL can create stored procedures in a database
SQL can create views in a database
SQL can set permissions on tables, procedures, and views
What are Constraints in SQL?
Constraints are used to specify the rules concerning data in the table. It can be applied for single or multiple fields in an SQL table during creation of table or after creating using the ALTER TABLE command.
The constraints are:
NOT NULL - Restricts NULL value from being inserted into a column.
CHECK - Verifies that all values in a field satisfy a condition.
DEFAULT - Automatically assigns a default value if no value has been specified for the field.
UNIQUE - Ensures unique values to be inserted into the field.
INDEX - Indexes a field providing faster retrieval of records.
PRIMARY KEY - Uniquely identifies each record in a table.
FOREIGN KEY - Ensures referential integrity for a record in another table.
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SQL Homework Help Questions
Write a SQL query to fetch the count of employees working in project 'P1'.
Write a SQL query to fetch employee names having salary greater than or equal to 5000 and less than or equal 10000.
Write a SQL query to fetch project-wise count of employees sorted by project's count in descending order.
Write a query to fetch only the first name(string before space) from the FullName column of EmployeeDetails table.
Write a query to fetch employee names and salary records. Return employee details even if the salary record is not present for the employee.
Write a SQL query to fetch all the Employees who are also managers from EmployeeDetails table.
Write a SQL query to fetch all employee records from EmployeeDetails table who have a salary record in EmployeeSalary table.
Write a SQL query to fetch duplicate records from a table.
Write a SQL query to remove duplicates from a table without using temporary table.
Write a SQL query to fetch only odd rows from table.
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