SELECT Statements
A SELECT statement can consist of the following basic clauses.
SELECT
INTO
FROM
JOIN
WHERE
GROUP BY
HAVING
UNION
ORDER BY
LIMIT
SELECT Syntax
The following syntax diagram outlines the syntax supported by the Microsoft Dynamics CRM adapter:
SELECT {
[ TOP <numeric_literal> ]
{
*
| {
<expression> [ [ AS ] <column_reference> ]
| { <table_name> | <correlation_name> } .*
} [ , ... ]
}
[ INTO csv:// [ filename= ] <file_path> [ ;delimiter=tab ] ]
{
FROM <table_reference> [ [ AS ] <identifier> ]
} [ , ... ]
[ [
INNER | { { LEFT | RIGHT | FULL } [ OUTER ] }
] JOIN <table_reference> [ ON <search_condition> ] [ [ AS ] <identifier> ]
] [ ... ]
[ WHERE <search_condition> ]
[ GROUP BY <column_reference> [ , ... ]
[
ORDER BY
{ <column_reference> [ ASC | DESC ] } [ , ... ]
]
[
LIMIT <expression>
[
{ OFFSET | , }
<expression>
]
]
} | SCOPE_IDENTITY()
<expression> ::=
| <column_reference>
| @ <parameter>
| ?
| COUNT( * | { <expression> } )
| { AVG | MAX | MIN | SUM | COUNT } ( <expression> )
| <literal>
| <sql_function>
<search_condition> ::=
{
<expression> { = | != | <> | < | > | <= | >= | IS NULL | IS NOT NULL | CONTAINS | LIKE | NOT LIKE | IN | NOT IN | AND | OR } [ <expression> ]
} [ { AND | OR } ... ]
Examples
Return all columns:
SELECT * FROM Lead
Rename a column:
SELECT "FirstName" AS MY_FirstName FROM Lead
Search data:
SELECT * FROM Lead WHERE FirstName <> 'Bob';
The Microsoft Dynamics CRM APIs support the following operators in the WHERE clause: =, !=, <>, <, >, <=, >=, IS NULL, IS NOT NULL, CONTAINS, LIKE, NOT LIKE, IN, NOT IN, AND, OR.
SELECT * FROM Lead WHERE FirstName <> 'Bob';
Return the number of items matching the query criteria:
SELECT COUNT(*) AS MyCount FROM Lead
Return the number of unique items matching the query criteria:
SELECT COUNT(DISTINCT FirstName) FROM Lead
Summarize data:
SELECT FirstName, MAX(Revenue) FROM Lead GROUP BY FirstName
Retrieve data from multiple tables.
SELECT Account.Id, Account.Name, Equipment.Id AS Eid, Equipment.Name AS Ename FROM Account JOIN Equipment ON Equipment.Id = Account.PreferredEquipmentId_Id
See
JOIN Queries for details.
Sort a result set in ascending order:
SELECT Id, FirstName FROM Lead ORDER BY FirstName ASC
Aggregate Functions
Examples of Aggregate Functions
Below are several examples of SQL aggregate functions. You can use these with a GROUP BY clause to aggregate rows based on the specified GROUP BY criterion. This can be a reporting tool.
COUNT
Returns the number of rows matching the query criteria.
SELECT COUNT(*) FROM Lead WHERE FirstName <> 'Bob'
COUNT_DISTINCT
Returns the number of distinct, non-null field values matching the query criteria.
SELECT COUNT_DISTINCT(Id) AS DistinctValues FROM Lead WHERE FirstName <> 'Bob'
AVG
Returns the average of the column values.
SELECT FirstName, AVG(Revenue) FROM Lead WHERE FirstName <> 'Bob' GROUP BY FirstName
MIN
Returns the minimum column value.
SELECT MIN(Revenue), FirstName FROM Lead WHERE FirstName <> 'Bob' GROUP BY FirstName
MAX
Returns the maximum column value.
SELECT FirstName, MAX(Revenue) FROM Lead WHERE FirstName <> 'Bob' GROUP BY FirstName
SUM
Returns the total sum of the column values.
SELECT SUM(Revenue) FROM Lead WHERE FirstName = 'Bob'
JOIN Queries
The adapter supports JOIN queries based on Dynamics CRM relationships. JOIN queries in Dynamics CRM can only be executed against related entities.
Dynamics CRM entities can be linked using relationships. The standard Dynamics CRM entities already have relationships defined for them. You can define relationships for your custom entities. The adapter supports standard SQL syntax instead of proprietary FetchXML to allow easy integration with a wide variety of SQL tools.
Inner Joins
Inner joins are the default join when the JOIN keyword is specified. The INNER and NATURAL keywords are also supported. The following query returns the Names of all Accounts that have Contacts and the FirstNames of those Contacts.
SELECT Account.Id, Account.Name, Contact.FirstName, Contact.LastName FROM Account JOIN Contact ON Account.Id = Contact.AccountId_Id
Left Join
Left joins can be executed with the LEFT JOIN and LEFT OUTER JOIN keywords. The following returns all Accounts and the Equipment Id for any preferred Equipment defined for that Account:
SELECT Account.Id, Account.Name, Equipment.Id AS Eid, Equipment.Name AS Ename FROM Account LEFT JOIN Equipment ON Account.PreferredEquipmentid_id = Equipment.Id WHERE Account.Name = 'Adventure Works (sample)'