Cinchy DML Statements

1. Overview

DML is used to add, retrieve, update and manipulate data.The Cinchy DML statements covered on this page are:

• ​SELECT​

• ​INSERT​

• ​UPDATE​

• ​DELETE​

• ​IF​

• ​Declare Variables​

• ​Set Variables​

SELECT

The SELECT statement is used to select data from a database. The data returned is stored in a result table, called the result-set.

Note: Table name requires domain prefix.

Syntax

SELECT [Column1],[Column2], ...
FROM [Domain].[Table_Name]

Example

SELECT [Full Name], [Email Address], [Start Date]
FROM [HR].[Employee]

Nested JSONs

You can create a query that will produce a nested JSON by wrapping it in an outer SELECT statement, such as in the example below.

Example Statement

SELECT (
SELECT 
(SELECT p1.[Parent A],p1.[Parent B] 
FROM [QA].[Parents 5080] p1 WHERE p1.[Parents]=p.[Parents]
FOR JSON PATH) As Parents,
(SELECT c.[Name] AS [Child Name]
FROM [QA].[Children 5080] c
WHERE c.[Deleted] IS NULL AND c.[Parents]= p.[Parents]
FOR JSON PATH) AS Children
FROM [QA].[Parents 5080] p
WHERE p.[Deleted] IS NULL
FOR JSON PATH, INCLUDE_NULL_VALUES)

Example Output

[
  {
    "Parents": [{ "Parent A": "Tom", "Parent B": "Maria" }],
    "Children": [
      { "Child Name": "John" },
      { "Child Name": "Theodor" },
      { "Child Name": "Lynette" }
    ]
  },
  {
    "Parents": [{ "Parent A": "Ray", "Parent B": "Sofia" }],
    "Children": [{ "Child Name": "Stephen" }]
  },
  {
    "Parents": [{ "Parent A": "Greg", "Parent B": "Mona" }],
    "Children": [{ "Child Name": "Elizabeth" }, { "Child Name": "Martin" }]
  },
  {
    "Parents": [{ "Parent A": "Henry", "Parent B": "Susanne" }],
    "Children": null
  }
]

INSERT

• An INSERT statement can be used to add new rows to a table or view

• You can also include a SELECT statement to identify that another table or view contains the data for the new row or rows.

Note: The table name requires the domain prefix.

Syntax

INSERT INTO [Domain].[Table_Name] ([Column1],[Column2],[Column3], ...)
VALUES ([Value1],[Value2],[Value3], ...)

Example

INSERT INTO [Contacts].[People] ([First Name],[Last Name],[Address],[Job Title])
VALUES (@firstname, @lastname, @address, @jobtitle)

UPDATE

The data in a table can be changed by using the UPDATE statement.

The UPDATE statement modifies zero or more rows of a table, depending on how many rows satisfy the search condition that was specified in the WHERE clause.

An UPDATE statement can also be used to specify the values that are to be updated in a single row.

• This is done by specifying constants, host variables, expressions, DEFAULT, or NULL. Specify NULL to remove a value from a row's column (without removing the row).

Note: Table name requires domain prefix.

Syntax

UPDATE [Domain].[Table_Name]
SET [Column1] = [Value1], [Column2] = [value2], ...
WHERE [condition]

Example

UPDATE [Revenue].[Customers]
SET [ContactName] = 'Alfred Schmidt', [City]= 'Frankfurt'
WHERE [Customer_ID] = 1;

DELETE

A DELETE statement can be used to remove entire rows from a table. The number of rows deleted depends on how many rows satisfy the search condition specified in the WHERE statement.

Note: Table name requires domain prefix.

Syntax

DELETE FROM [Domain].[Table_Name] WHERE [condition]

Example

DELETE FROM [Revenue].[Customers] WHERE [CustomerName] = 'Alfreds Futterkiste';

IF

The IF statement is used to execute a condition. If the condition is satisfied then the boolean expressions returns TRUE value. The optional ELSE keyword introduces another statement that is executed when the IF condition is not satisfied and returns FALSE value.

Syntax

IF [condition] THEN [value_if_true] ELSE [value_if_false]

Example

IF 500<1000 THEN 'YES' ELSE 'NO'

Declare Variable

The DECLARE statement is used to declare a variable.

Syntax

DECLARE @variable_name variable_type;

Example

DECLARE @var varchar(50);

Set Variable

The SET variable is used to set a value to a variable.

Syntax

SET @variable_name = variable_value

Example

SET @var = 'Alfreds Futterkiste'