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This SQL tutorial explains how to use the SQL EXISTS condition with syntax and examples.

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Description

The SQL EXISTS condition is used in combination with a subquery and is considered to be met, if the subquery returns at least one row. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

Syntax

The syntax for the EXISTS condition in SQL is:

Parameters or Arguments

subquery
The subquery is a SELECT statement. If the subquery returns at least one record in its result set, the EXISTS clause will evaluate to true and the EXISTS condition will be met. If the subquery does not return any records, the EXISTS clause will evaluate to false and the EXISTS condition will not be met.

Note

  • SQL statements that use the EXISTS condition are very inefficient since the sub-query is rerun for EVERY row in the outer query's table. There are more efficient ways to write most queries, that do not use the EXISTS condition.

DDL/DML for Examples

If you want to follow along with this tutorial, get the DDL to create the tables and the DML to populate the data. Then try the examples in your own database!

Example - Using EXISTS Condition with the SELECT Statement

Let's start by looking at an example that shows how to use the EXISTS condition with a SELECT statement.

In this example, we have a customers table with the following data:

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customer_idlast_namefirst_namefavorite_website
4000JacksonJoetechonthenet.com
5000SmithJanedigminecraft.com
6000FergusonSamanthabigactivities.com
7000ReynoldsAllencheckyourmath.com
8000AndersonPaigeNULL
9000JohnsonDerektechonthenet.com

And a table called orders with the following data:

order_idcustomer_idorder_date
170002016/04/18
250002016/04/18
380002016/04/19
440002016/04/20

Now let's find all of the records from the customers table where there is at least one record in the orders table with the same customer_id. Enter the following SELECT statement:

Try It

There will be 4 records selected. These are the results that you should see:

customer_idlast_namefirst_namefavorite_website
4000JacksonJoetechonthenet.com
5000SmithJanedigminecraft.com
7000ReynoldsAllencheckyourmath.com
8000AndersonPaigeNULL

In this example, there are 4 records in the customers where the customer_id value appears in the orders table.

Example - Using EXISTS Condition with the UPDATE Statement

Let's look at an example that uses the EXISTS condition in an UPDATE statement.

In this example, we have a table called products with the following data:

product_idproduct_namecategory_id
1Pear50
2Banana50
3Orange50
4Apple50
5Bread75
6Sliced Ham25
7KleenexNULL

And a table called summary_data with the following data:

Now let's update the summary_data table with values from the products table. Enter the following SQL statement:

There will be 5 records update. Select the data from the summary_data table again:

These are the results that you should see:

product_idcurrent_category
150
250
350
450
575
810

This example would update the current_category field in the summary_data table with the category_id from the products table where the product_id values match. The first 5 records in the summary_data table have been updated.

TIP: If we hadn't included the EXISTS condition, the UPDATE query would have updated the current_category field to NULL in the 6th row of the summary_data table (because the products table does not have a record where product_id=8).

Example - Using EXISTS Condition with the DELETE Statement

Let's look at an example that uses the EXISTS condition in a DELETE statement.

In this example, we have a table called customers with the following data:

customer_idlast_namefirst_namefavorite_website
4000JacksonJoetechonthenet.com
5000SmithJanedigminecraft.com
6000FergusonSamanthabigactivities.com
7000ReynoldsAllencheckyourmath.com
8000AndersonPaigeNULL
9000JohnsonDerektechonthenet.com

And a table called orders with the following data:

order_idcustomer_idorder_date
170002016/04/18
250002016/04/18
380002016/04/19
440002016/04/20
5NULL2016/05/01

Enter the following DELETE statement:

There will be 1 record deleted. Select the data from the orders table again:

These are the results that you should see:

order_idcustomer_idorder_date
170002016/04/18
250002016/04/18
380002016/04/19
5NULL2016/05/01
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This example would delete all records from the orders table where there is a record in the customers table with the last_name of 'Jackson' and a matching customer_id value in both tables. In this example, the record for order_id=4 was deleted.

If you want to determine the number of rows that will be deleted, you can run the following SELECT statement before performing the delete.

This will return number of records that will be deleted when you execute the DELETE statement.

COUNT(*)
1

Example - Using NOT with the EXISTS Condition

Finally, the NOT condition can be combined with the EXISTS condition to create a NOT EXISTS condition. Let's look at an example that shows how to use the NOT EXISTS condition in SQL.

In this example, we have a table called customers with the following data:

customer_idlast_namefirst_namefavorite_website
4000JacksonJoetechonthenet.com
5000SmithJanedigminecraft.com
6000FergusonSamanthabigactivities.com
7000ReynoldsAllencheckyourmath.com
8000AndersonPaigeNULL
9000JohnsonDerektechonthenet.com

And a table called orders with the following data:

order_idcustomer_idorder_date
170002016/04/18
250002016/04/18
380002016/04/19
440002016/04/20
5NULL2016/05/01

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Enter the following SQL statement:

Try It

There will be 2 records selected. These are the results that you should see:

customer_idlast_namefirst_namefavorite_website
6000FergusonSamanthabigactivities.com
9000JohnsonDerektechonthenet.com

This example would return all records from the customers table where there are no records in the orders table for the given customer_id.

The map shows day and night on Earth and the positions of the Sun (subsolar point) and the Moon (sublunar point) right now.

UTC time = Tuesday, 3 August 2021, 14:34:00.

Jump to: -4 weeks -1 day -12 hours -6 hours -1 hour -10 minutes Now +10 minutes +1 hour +6 hours +12 hours +1 day +4 weeks

March equinox June solstice September equinox December solstice

= The Sun's position directly overhead (zenith) in relation to an observer.

= The Moon's position at its zenith in relation to an observer (Moon phase is not shown).

= Civil Twilight (lightest shade)

= Nautical Twilight

= Astronomical Twilight

= Night, no twilight (darkest shade)

Position of the Sun: Subsolar Point

On Tuesday, 3 August 2021, 14:34:00 UTC the Sun is at its zenith at Latitude: 17° 20' North, Longitude: 36° 57' West

The ground speed is currently 442.92 meters/second, 1594.5 kilometres/hour, 990.8 miles/hour or 861.0 nautical miles/hour (knots). The table below shows position of the the Sun compared to the time and date above:

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TimeLongitude DifferenceLatitude DifferenceTotal
LaterDegreesDistanceDirectionDegreesDistanceDirectionDistance
1 minute0° 15' 00.1'26.58 kmWest0° 00' 00.7'0.02 kmSouth26.58 km
1 hour15° 00' 03.2'1594.10 kmWest0° 00' 39.6'1.22 kmSouth1594.15 km
24 hours0° 01' 22.0'2.43 kmWest0° 15' 59.7'29.50 kmSouth29.60 km

Position of the Moon: Sublunar Point

On Tuesday, 3 August 2021, 14:34:00 UTC the Moon is at its zenith at Latitude: 23° 04' North, Longitude: 97° 36' West

The ground speed is currently 413.10 meters/second, 1487.1 kilometres/hour, 924.1 miles/hour or 803.0 nautical miles/hour (knots). The table below shows position of the the Moon compared to the time and date above:

TimeLongitude DifferenceLatitude DifferenceTotal
LaterDegreesDistanceDirectionDegreesDistanceDirectionDistance
1 minute0° 14' 30.6'24.79 kmWest0° 00' 06.0'0.18 kmNorth24.79 km
1 hour14° 30' 42.2'1486.44 kmWest0° 05' 57.4'11.00 kmNorth1485.93 km
24 hours11° 58' 48.8'1227.30 kmEast1° 52' 48.3'208.24 kmNorth1236.16 km

Locations With the Sun Near Its Zenith

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The following table shows 10 locations with Sun near zenith position in the sky.

LocationLocal TimeDistanceDirection
PraiaTue 13:341463 km909 miles790 nm E
DakarTue 14:342109 km1311 miles1139 nm E
CayenneTue 11:342166 km1346 miles1169 nm SW
NouakchottTue 14:342225 km1383 miles1202 nm E
BanjulTue 14:342228 km1385 miles1203 nm E
FortalezaTue 11:342336 km1452 miles1262 nm S
ParamariboTue 11:342356 km1464 miles1272 nm WSW
BissauTue 14:342379 km1478 miles1285 nm ESE
BelémTue 11:342432 km1511 miles1313 nm SSW
BridgetownTue 10:342478 km1540 miles1338 nm W