- Which of the following is used to return only different values?
- How do I return the number of different values in SQL?
- Which of the following is used to return data in SQL?
- Which SQL statement is used to update data in a database?
- What is the difference between commit rollback and savepoint?
- Which procedures have return values?
- What is return in SQL?
- What is the difference between COMMIT and savepoint in SQL?
- What is the difference between COMMIT and rollback?
- Which SQL statement is used?
- Can PL SQL procedure return a value?
- Does function return a value?
- How do you write a RETURN statement in SQL?
- What is the difference between savepoint and ROLLBACK?
- What is the difference between ROLLBACK and ROLLBACK to?
- What is the difference between ROLLBACK and savepoint?
- What is ROLLBACK statement in SQL?
- What are different types of statements supported by SQL?
- What are the different data types used in SQL?
Which of the following is used to return only different values?
The SELECT DISTINCT statementWhich SQL statement is used to return only different values? Explanation: The SELECT DISTINCT statement is used to return only distinct (different) values.
How do I return the number of different values in SQL?
To count the number of different values that are stored in a given column, you simply need to designate the column you pass in to the COUNT function as DISTINCT . When given a column, COUNT returns the number of values in that column. Combining this with DISTINCT returns only the number of unique (and non-NULL) values.
Which of the following is used to return data in SQL?
The SQL SELECT Statement The SELECT statement is used to select data from a database. The data returned is stored in a result table, called the result-set.
Which SQL statement is used to update data in a database?
The UPDATE statement in SQL is used to update the data of an existing table in database. We can update single columns as well as multiple columns using UPDATE statement as per our requirement. UPDATE table_name SET column1 = value1, column2 = value2,…
What is the difference between commit rollback and savepoint?
COMMIT − to save the changes. ROLLBACK − to roll back the changes. SAVEPOINT − creates points within the groups of transactions in which to ROLLBACK. SET TRANSACTION − Places a name on a transaction.
Which procedures have return values?
Stored functions have a return value and can also take a list of input, output, and input-output parameters.
What is return in SQL?
The RETURN statement is used to unconditionally and immediately end an SQL procedure by returning the flow of control to the caller of the stored procedure. When the RETURN statement runs, it must return an integer value. If the return value is not provided, the default is 0.
What is the difference between COMMIT and savepoint in SQL?
COMMIT − to save the changes. ROLLBACK − to roll back the changes. SAVEPOINT − creates points within the groups of transactions in which to ROLLBACK.
What is the difference between COMMIT and rollback?
A COMMIT statement is used to save the changes on the current transaction is permanent. A Rollback statement is used to undo all the changes made on the current transaction. Once the current transaction is completely executed using the COMMIT command, it can’t undo its previous state.
Which SQL statement is used?
The SQL SELECT Statement The SELECT statement is used to select data from a database. The data returned is stored in a result table, called the result-set.
Can PL SQL procedure return a value?
A Procedure in SQL can have a RETURN statement to return the control to the calling block, but it cannot return any values through the RETURN statement. Procedures cannot be called directly from SELECT statements. They can be called from another block or through EXEC keyword.
Does function return a value?
A return is a value that a function returns to the calling script or function when it completes its task. A return value can be any one of the four variable types: handle, integer, object, or string. The type of value your function returns depends largely on the task it performs.
How do you write a RETURN statement in SQL?
The return status value can be included in subsequent Transact-SQL statements in the batch or procedure that executed the current procedure, but it must be entered in the following form: EXECUTE @return_status =
What is the difference between savepoint and ROLLBACK?
COMMIT − to save the changes. ROLLBACK − to roll back the changes. SAVEPOINT − creates points within the groups of transactions in which to ROLLBACK. SET TRANSACTION − Places a name on a transaction.
What is the difference between ROLLBACK and ROLLBACK to?
Difference between the COMMIT and ROLLBACKComparison Based on ParametersCOMMIT StatementROLLBACK StatementDefinition/ BasicA COMMIT statement is used to save the changes on the current transaction is permanent.A Rollback statement is used to undo all the changes made on the current transaction.
What is the difference between ROLLBACK and savepoint?
ROLLBACK − to roll back the changes. SAVEPOINT − creates points within the groups of transactions in which to ROLLBACK. SET TRANSACTION − Places a name on a transaction.
What is ROLLBACK statement in SQL?
The ROLLBACK statement is the inverse of the COMMIT statement. It undoes some or all database changes made during the current transaction. If the statement fails, a rollback to this implicit savepoint is done. Normally, just the failed SQL statement is rolled back, not the whole transaction.
What are different types of statements supported by SQL?
Types of SQL StatementsData Definition Language (DDL) Statements.Data Manipulation Language (DML) Statements.Transaction Control Statements.Session Control Statements.System Control Statement.Embedded SQL Statements.
What are the different data types used in SQL?
Data types in SQL Server are organized into the following categories:Exact numerics. Unicode character strings.Approximate numerics. Binary strings.Date and time. Other data types.Character strings.bigint. numeric.bit. smallint.decimal. smallmoney.int. tinyint.