**Contents**show

## How can I find the difference between two values in SQL?

SQL Server **DIFFERENCE() Function**

The DIFFERENCE() function compares two SOUNDEX values, and returns an integer. The integer value indicates the match for the two SOUNDEX values, from 0 to 4. 0 indicates weak or no similarity between the SOUNDEX values.

## How do you subtract data in SQL?

The SQL **MINUS operator** is used to return all rows in the first SELECT statement that are not returned by the second SELECT statement. Each SELECT statement will define a dataset. The MINUS operator will retrieve all records from the first dataset and then remove from the results all records from the second dataset.

## How do you subtract two numbers in SQL?

Arithmetic operators can perform arithmetical operations on numeric operands involved. Arithmetic operators are addition(+), subtraction(-), multiplication(*) and division(/).

…

Arithmetic Operators.

Operator | Meaning | Operates on |
---|---|---|

– (Subtract) | Subtraction | Numeric value |

* (Multiply) | Multiplication | Numeric value |

/ (Divide) | Division | Numeric value |

## How many tables can be join in SQL query?

Theoretically, there is no upper limit on the number of tables that can be joined using a SELECT statement. (One join condition always combines two tables!) However, the Database Engine has an implementation restriction: the maximum number of tables that can be joined in a SELECT statement is **64**.

## How do I find absolute value in SQL?

**ABS() Function in SQL Server**

- ABS() function : This function in SQL Server is used to return the absolute value of a specified number. …
- Features :
- Syntax : SELECT ABS(number);
- Parameter : This method accepts a parameter as given below:
- Returns : …
- Example-1 : …
- Output : 0.
- Example-2 :

## How do I get a count in SQL query?

**SQL COUNT() Function**

- SQL COUNT(column_name) Syntax. The COUNT(column_name) function returns the number of values (NULL values will not be counted) of the specified column: …
- SQL COUNT(*) Syntax. The COUNT(*) function returns the number of records in a table: …
- SQL COUNT(DISTINCT column_name) Syntax.

## How can get second highest salary in SQL Server?

**How To Find Second Highest Salary Using a Sub-Query**

- SELECT TOP 1 SALARY.
- FROM (
- SELECT DISTINCT TOP 2 SALARY.
- FROM tbl_Employees.
- ORDER BY SALARY DESC.
- ) RESULT.
- ORDER BY SALARY.

## What is difference between MINUS and except in SQL?

2 Answers. **There is no difference between Oracle MINUS** and SQL Server EXCEPT. They are intended to do the same thing. This will check for any result set from the first query, then run the except if there is a result.

## How do I subtract one date from another in SQL?

**Using DATEADD Function and Examples**

- Add 30 days to a date SELECT DATEADD(DD,30,@Date)
- Add 3 hours to a date SELECT DATEADD(HOUR,-3,@Date)
- Subtract 90 minutes from date SELECT DATEADD(MINUTE,-90,@Date)
- Check out the chart to get a list of all options.

## Which query is used to get the current date?

**MySQL SYSDATE() Function**

The SYSDATE() function returns the current date and time. Note: The date and time is returned as “YYYY-MM-DD HH:MM:SS” (string) or as YYYYMMDDHHMMSS (numeric).

## How do I subtract two numbers in MySQL?

**Introduction to SQL MINUS operator**

- SELECT select_list1 FROM table_name1 MINUS SELECT select_list2 FROM table_name2;
- CREATE TABLE t1 ( id INT PRIMARY KEY ); CREATE TABLE t2 ( id INT PRIMARY KEY ); INSERT INTO t1 VALUES (1),(2),(3); INSERT INTO t2 VALUES (2),(3),(4);
- SELECT id FROM t1 MINUS SELECT id FROM t2;

## How can I merge two tables in SQL query?

**Key learnings**

- use the keyword UNION to stack datasets without duplicate values.
- use the keyword UNION ALL to stack datasets with duplicate values.
- use the keyword INNER JOIN to join two tables together and only get the overlapping values.

## Can we join 4 tables in SQL?

If you have to join another table, you can use another JOIN operator with an appropriate condition in the ON clause. In theory, **you can join as many tables as you want**.

## Why commit is used in SQL?

Use the COMMIT statement **to end your current transaction and make permanent all changes performed in the transaction**. A transaction is a sequence of SQL statements that Oracle Database treats as a single unit. This statement also erases all savepoints in the transaction and releases transaction locks.