Dynamics NAV

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 SQL engine of the provider:

SELECT { [ TOP <numeric_literal> | DISTINCT ] { * | { <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> [ , ... ] [ HAVING <search_condition> ] [ UNION [ ALL ] <select_statement> ] [ ORDER BY <column_reference> [ ASC | DESC ] [ NULLS FIRST | NULLS LAST ] ] [ LIMIT <expression> [ { OFFSET | , } <expression> ] ] } | SCOPE_IDENTITY() <expression> ::= | <column_reference> | @ <parameter> | ? | COUNT( * | { [ DISTINCT ] <expression> } ) | { AVG | MAX | MIN | SUM | COUNT } ( <expression> ) | NULLIF ( <expression> , <expression> ) | COALESCE ( <expression> , ... ) | CASE <expression> WHEN { <expression> | <search_condition> } THEN { <expression> | NULL } [ ... ] [ ELSE { <expression> | NULL } ] END | <literal> | <sql_function> <search_condition> ::= { <expression> { = | > | < | >= | <= | <> | != | LIKE | NOT LIKE | IN | NOT IN | IS NULL | IS NOT NULL | AND | OR | CONTAINS | BETWEEN } [ <expression> ] } [ { AND | OR } ... ]

Examples

1. Return all columns:

   SELECT * FROM Customer
2. Rename a column:

   SELECT [Contact] AS MY_Contact FROM Customer
3. Cast a column's data as a different data type:

   SELECT CAST(AnnualRevenue AS VARCHAR) AS Str_AnnualRevenue FROM Customer
4. Search data:

   SELECT * FROM Customer WHERE Name <> 'CData, Inc.'
5. Return the number of items matching the query criteria:

   SELECT COUNT(*) AS MyCount FROM Customer
6. Return the number of unique items matching the query criteria:

   SELECT COUNT(DISTINCT Contact) FROM Customer
7. Return the unique items matching the query criteria:

   SELECT DISTINCT Contact FROM Customer
8. Summarize data:

   SELECT Contact, MAX(AnnualRevenue) FROM Customer GROUP BY Contact

   See Aggregate Functions below for details.

9. Retrieve data from multiple tables.

   SELECT Customer.Name, SalesOrder.Document_No FROM Customer, SalesOrder WHERE Customer.No=SalesOrder.Sell_to_Customer_No

   See JOIN Queries below for details.

10. Sort a result set in ascending order:

    SELECT No, Contact FROM Customer ORDER BY Contact ASC
11. Restrict a result set to the specified number of rows:

    SELECT No, Contact FROM Customer LIMIT 10
12. Parameterize a query to pass in inputs at execution time. This enables you to create prepared statements and mitigate SQL injection attacks.

    SELECT * FROM Customer WHERE Name = @param

Aggregate Functions

COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Customer WHERE Name = 'CData, Inc.'

COUNT(DISTINCT)

Returns the number of distinct, non-null field values matching the query criteria.

SELECT COUNT(DISTINCT No) AS DistinctValues FROM Customer WHERE Name <> 'CData, Inc.'

AVG

Returns the average of the column values.

SELECT Contact, AVG(AnnualRevenue) FROM Customer WHERE Name <> 'CData, Inc.' GROUP BY Contact

MIN

Returns the minimum column value.

SELECT MIN(AnnualRevenue), Contact FROM Customer WHERE Name <> 'CData, Inc.' GROUP BY Contact

MAX

Returns the maximum column value.

SELECT Contact, MAX(AnnualRevenue) FROM Customer WHERE Name <> 'CData, Inc.' GROUP BY Contact

SUM

Returns the total sum of the column values.

SELECT SUM(AnnualRevenue) FROM Customer WHERE Name = 'CData, Inc.'

JOIN Queries

The Provider for Microsoft Dynamics NAV supports standard SQL joins like the following examples.

Inner Join

An inner join selects only rows from both tables that match the join condition:

SELECT Customer.Name, SalesOrder.Document_No FROM Customer, SalesOrder WHERE Customer.No=SalesOrder.Sell_to_Customer_No

Left Join

A left join selects all rows in the FROM table and only matching rows in the JOIN table:

SELECT Customer.Name, SalesOrder.Document_No FROM Customer LEFT OUTER JOIN SalesOrder ON Customer.No=SalesOrder.Sell_to_Customer_No

Date Literal Functions

The following date literal functions can be used to filter date fields using relative intervals. Note that while the <, >, and = operators are supported for these functions, <= and >= are not.

L_TODAY()

The current day.

SELECT * FROM MyTable WHERE MyDateField = L_TODAY()

L_YESTERDAY()

The previous day.

SELECT * FROM MyTable WHERE MyDateField = L_YESTERDAY()

L_TOMORROW()

The following day.

SELECT * FROM MyTable WHERE MyDateField = L_TOMORROW()

L_LAST_WEEK()

Every day in the preceding week.

SELECT * FROM MyTable WHERE MyDateField = L_LAST_WEEK()

L_THIS_WEEK()

Every day in the current week.

SELECT * FROM MyTable WHERE MyDateField = L_THIS_WEEK()

L_NEXT_WEEK()

Every day in the following week.

SELECT * FROM MyTable WHERE MyDateField = L_NEXT_WEEK()

Also available:

• L_LAST/L_THIS/L_NEXT MONTH

• L_LAST/L_THIS/L_NEXT QUARTER

• L_LAST/L_THIS/L_NEXT YEAR

L_LAST_N_DAYS(n)

The previous n days, excluding the current day.

SELECT * FROM MyTable WHERE MyDateField = L_LAST_N_DAYS(3)

L_NEXT_N_DAYS(n)

The following n days, including the current day.

SELECT * FROM MyTable WHERE MyDateField = L_NEXT_N_DAYS(3)

Also available:

• L_LAST/L_NEXT_90_DAYS

L_LAST_N_WEEKS(n)

Every day in every week, starting n weeks before current week, and ending in the previous week.

SELECT * FROM MyTable WHERE MyDateField = L_LAST_N_WEEKS(3)

L_NEXT_N_WEEKS(n)

Every day in every week, starting the following week, and ending n weeks in the future.

SELECT * FROM MyTable WHERE MyDateField = L_NEXT_N_WEEKS(3)

Also available:

• L_LAST/L_NEXT_N_MONTHS(n)

• L_LAST/L_NEXT_N_QUARTERS(n)

• L_LAST/L_NEXT_N_YEARS(n)