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Multiple choice questions: a. The selected table at the top of the query window. b. The field name comes up in the avail…
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Subtask 1: Create a MS Access database. Subtask 2: Create a chart. Subtask 3: Create a PowerPoint presentation template.
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Which of this application is use for processing data (a) FORTRAN (b) BASIC (c) word (d) SQL
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using questionnaire, interviews, observation, experiment, database and electronic media or internet
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Consider the following relational database schema where the fields StudentId and SubjectCode in the table Results are de…
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Define the concept "relational database". State TWO benefits of relational database over flat file database to a secreta…
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Assess the importance of constraints such as UNIQUE and CHECK constraints in enforcing data consistency, validity, and b…
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Which of the following normalization forms ensures that each non-key column is dependent only on the primary key?
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Develop a set of constraints for a database table that ensures each email address entered is unique and not null.
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How does the architectural level of database architecture contribute to system scalability?
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Your task is to build a database that will make it easier for staff to search for books, contact members, and monitor wh…
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E. System Design: This section describes the detailed architecture of the proposed system. It includes how the system co…
View SolutionAbout SQL
This hub covers databases and the language used to query them: what a database is, how tables relate, keys and normalisation, and the SQL statements that create, read and change data. The questions run from definitions and normal forms to writing a SELECT for a given requirement.
Popular Topics in SQL
Relational Databases
Tables, records and fields, the relational model, and the advantages over flat files.
Keys
Primary, composite, foreign and candidate keys, referential integrity and how relationships are enforced.
SQL Queries
SELECT with WHERE, ORDER BY, aggregate functions, GROUP BY and HAVING.
Joins
Inner and outer joins, joining on a foreign key, and querying across several tables.
Data Definition & Manipulation
CREATE, ALTER and DROP, and INSERT, UPDATE and DELETE with their constraints.
Normalisation
First, second and third normal form, partial and transitive dependency, and why redundancy is removed.
Constraints
NOT NULL, UNIQUE, CHECK and DEFAULT, and validation at the database level.
Database Design
Entity-relationship diagrams, cardinality, and turning a scenario into a schema.
How ScanSolve Helps with SQL
ScanSolve writes the query and then explains each clause, so the answer shows why the WHERE and the GROUP BY are where they are. For design questions the schema is given as tables with their keys marked, which is the form these answers are marked in.
Normalisation questions are answered stage by stage — the dependency that breaks the current form, then the tables that result — rather than asserting the final schema. Where a question describes a requirement in words, the answer restates it as the conditions the query must express before writing any SQL.
Study Tips for SQL
Learn the clause order: SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY. Queries fail on order more than on syntax.
Identify the primary key of each table before drawing relationships. Everything else in design follows from the keys.
For normalisation, name the dependency you are removing at each step. That is the mark, not the final tables.
Remember that WHERE filters rows and HAVING filters groups. Questions about aggregates test precisely that.
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ScanSolve covers all sql topics including Relational Databases, Keys, SQL Queries, Joins, Data Definition & Manipulation. Upload any sql problem and get a step-by-step solution.
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