What does the on Statement do in SQL?
ON Clause can be used to join columns that have different names. We use ON clause to specify a join condition. This lets us specify join conditions separate from any search or filter conditions in the WHERE clause.
How do you comment out a statement in SQL?
Comments Within SQL Statements
- Begin the comment with a slash and an asterisk (/*). Proceed with the text of the comment. This text can span multiple lines.
- Begin the comment with — (two hyphens). Proceed with the text of the comment. This text cannot extend to a new line.
Can I use in SQL statement?
The SQL IN condition (sometimes called the IN operator) allows you to easily test if an expression matches any value in a list of values. It is used to help reduce the need for multiple OR conditions in a SELECT, INSERT, UPDATE, or DELETE statement.
What are queries in SQL?
A query is a request for data or information from a database table or combination of tables. This data may be generated as results returned by Structured Query Language (SQL) or as pictorials, graphs or complex results, e.g., trend analyses from data-mining tools.
What kind of language is SQL?
Structured Query Language, commonly known as SQL, is a standard programming language for relational databases. Despite being older than many other types of code, it is the most widely implemented database language.
Which of the SQL statement is correct?
Discussion Forum
| Que. | Which of the SQL statements is correct? |
|---|---|
| b. | SELECT Username, Password FROM Users |
| c. | SELECT Username, Password WHERE Username = ‘user1’ |
| d. | None of these |
| Answer:SELECT Username, Password FROM Users |
What are the different DML commands in SQL?
List of DML commands:
- INSERT : It is used to insert data into a table.
- UPDATE: It is used to update existing data within a table.
- DELETE : It is used to delete records from a database table.
- LOCK: Table control concurrency.
- CALL: Call a PL/SQL or JAVA subprogram.
- EXPLAIN PLAN: It describes the access path to data.