Tsql str

Tsql str DEFAULT

STR() Function in SQL Server

The STR() function converts a numeric value to a character value.

Syntax :

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STR(float_expression [, length [, decimal]])

Parameter : This method accepts three parameters as mentioned above and described below :

  • float_expression : It is a numeric expression that evaluates to an approximate number with a decimal point.
  • length : It is the total length of the returned string.
  • decimal : It is the number of places to the right of the decimal point.

Returns : It returns a number as a string.



Example-1 :

SELECT STR(246.573, 6, 2);

Output :

246.57



Example-2 :

SELECT STR(246.573, 3, 3);

Output :

246



Example-3 :

SELECT STR(246.573, 2, 2);

Output :

**



Example-4 :

SELECT STR(246.573, 8, 4);

Output :

246.5730
Sours: https://www.geeksforgeeks.org/str-function-in-sql-server/

Summary: in this tutorial, you will learn how to use the SQL Server function to convert numeric value to character value.

SQL Server function overview

The following statement does not work:

Code language:SQL (Structured Query Language)(sql)

Here is the error message:

Code language:SQL (Structured Query Language)(sql)

To make it works, you need to convert the number 1 into a string ‘1’ by using the function:

Code language:SQL (Structured Query Language)(sql)

The function converts a numeric value to a character value. The following shows the syntax of the function:

Code language:SQL (Structured Query Language)(sql)

In this syntax:

  • is a numeric expression that evaluates to an approximate number with a decimal point.
  • is the total length of the returned string. It includes a decimal point, sign, digits, and spaces. By default, the length is 10 if you skip it. If the is zero, the function returns NULL.
  • is the number of places to the right of the decimal point of the to be returned. must be less than or equal to 16. If it is bigger than 16, then the function truncates the result to sixteen places to the right of the decimal point.

SQL Server function examples

This example uses the function to convert a number that consists of six digits and a decimal point to a six-position character string with two decimal places:

Code language:SQL (Structured Query Language)(sql)

Here is the output:

Code language:CSS(css)

If the length of the number exceeds the specified length, the function returns as shown in the following example:

Code language:SQL (Structured Query Language)(sql)

The following shows the output:

Another example of the insufficient length is:

Code language:SQL (Structured Query Language)(sql)

Here is the output:

In this tutorial, you have learned how to use the SQL Server function to convert numeric value to character value.

Sours: https://www.sqlservertutorial.net/sql-server-string-functions/sql-server-str-function/
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Database.Guide

In SQL Server, the T-SQL function returns character data converted from numeric data. The return value has a return type of varchar.

You provide the numeric data as an argument when calling the function. The function then converts it to character data. There are also two optional arguments that you can use to specify the length, and the number of places to the right of the decimal point.

Syntax

The syntax goes like this:

STR ( float_expression [ , length [ , decimal ] ] )

Where is an expression of approximate numeric (float) data type with a decimal point.

is an optional argument you can use to specify the total length. This includes decimal point, sign, digits, and spaces. The default is 10.

is the number of places to the right of the decimal point. This can be a maximum value of 16. If more than that, it’s truncated to 16.

Example 1 – Basic Usage

Here’s an example of how it works:

SELECT STR(123.45) AS Result;

Result:

+------------+ | Result | |------------| | 123 | +------------+

Example 2 – Rounding

By default, the number is rounded to an integer. If we adjust the input from the previous example (eg, increase the fractional part from to ) we get the following:

SELECT STR(123.55) AS Result;

Result:

+------------+ | Result | |------------| | 124 | +------------+

Example 3 – Length

When using the optional parameter, its value should be greater than or equal to the part of the number before the decimal point plus the number’s sign (if any).

For example, the following is fine, because is greater than the part of the number before the decimal point:

SELECT STR(123.55, 4) AS Result;

Result:

+----------+ | Result | |----------| | 124 | +----------+

However, the following example demonstrates what happens when the value is too small:

SELECT STR(123.55, 2) AS Result;

Result:

+----------+ | Result | |----------| | ** | +----------+

Also note that determines the length of the output, and includes the decimal point, sign, digits, and spaces. The default length is 10.

Here’s an example to demonstrate the difference in output depending on the value of the argument:

SELECT 123 AS '123', STR(123, 3) AS '3', STR(123, 10) AS '10', STR(123, 16) AS '16';

Result:

+-------+-----+------------+------------------+ | 123 | 3 | 10 | 16 | |-------+-----+------------+------------------| | 123 | 123 | 123 | 123 | +-------+-----+------------+------------------+

For another way to demonstrate this, in the following example I trim the output using the function (and compare it to the untrimmed version):

SELECT TRIM(STR(123, 16)) AS 'A', STR(123, 16) AS 'B';

Result:

+-----+------------------+ | A | B | |-----+------------------| | 123 | 123 | +-----+------------------+

Example 4 – Decimal Places

Here’s an example of using the optional parameter:

SELECT STR(123.55, 8, 4) AS Result;

Result:

+----------+ | Result | |----------| | 123.5500 | +----------+

Notice that I increased the value for in order to accommodate the decimal places.

If I reduce the value to , I get this:

SELECT STR(123.55, 6, 4) AS Result;

Result:

+----------+ | Result | |----------| | 123.55 | +----------+

SQL, SQL Serverfunctions, mssql, string functions, t-sql

Sours: https://database.guide/how-the-str-function-works-in-sql-server-t-sql/
Querying Microsoft SQL Server (T-SQL) - Udemy Instructor, Phillip Burton [bestseller]

Striim SQL Server CDC

In this post we cover the built-in SQL Server CDC functionality, how to set it up, and some pros and cons of this feature. We also introduce Striim’s high-speed, reliable SQL Server CDC solution.

Introduction

SQL Server CDC Methods

Introduction

What is Change Data Capture?

Change Data Capture (CDC) is a software process that identifies and tracks changes in a database. There are various CDC methods, each with their pros and cons, but the main benefit of CDC is that it enables near-real-time data movement from databases. Continuous data capture is important for both analytics use cases (where timely data is used to make decisions) and zero-downtime cloud migrations (where operational databases can’t be taken offline for extended periods).

What is SQL Server? 

Microsoft SQL Server is a relational database management system (RDMS) developed by Microsoft. SQL Server is mainly used to store and retrieve data. For the purposes of analysis and business intelligence, data is typically replicated to a data warehouse optimized for large analytics queries.

Change Data Capture is an ideal solution for replication of SQL Server data in near real-time. In this post, we’ll share an overview of both SQL Server’s native CDC functionality and Striim’s high-speed SQL Server CDC reader.

SQL Server CDC Methods

Native SQL Server CDC

SQL Server offers a native CDC functionality, as depicted in the diagram below.

SQL Server CDC feature

The source table contains the data that’s being inserted, updated, and deleted by applications. The SQL Server transaction log keeps a record of the changes. If CDC is enabled, a SQL Server agent reads inserts, updates, and deletes from the transaction log. These changes are added to a separate change table, wherequery functionsare used to capture the changes so they can be delivered to a target data warehouse or other destination via a data integration process like ETL.

What are the benefits and drawbacks of the native SQL Server Change Data Capture feature?

Pros:

  • Built-in feature, no external tools needed
  • Uses familiar T-SQL language

Cons:

  • Adding a change table adds overhead to the source database
  • Querying change tables adds latency
  • Change tables need to be cleaned up on a regular basis
  • Since a change table is created for each CDC-enabled table, it can be challenging to consolidate changes from multiple tables (and databases)

Tutorial: How to set up the native SQL Server CDC functionality

This tutorial describes how to set up change data capture (CDC) in SQL Server using Microsoft’s AdventureWorks sample database to illustrate the steps.

For additional information see SQL Server setup in the documentation.

Prerequisites

The following are required to complete this tutorial: 

  • Existing SQL Server running instance
  • SQL Server management tools
  • (Optional) AdventureWorks sample database

Set up Database-Level CDC

CDC must be enabled both at the database and table level in SQL Server. Database-level CDC functionality is enabled by setting is_cdc_enabled to 1 in the sys.databases table.

Invoke the following commands to check the current state of database-level CDC functionality:

USE AdventureWorksDW2019 GO SELECT database_id, name, is_cdc_enabled FROM sys.databases GO

Locate your database (e.g., AdventureWorks2019) in the resultset. If is_cdc_enabled is 0 as shown below, then CDC is not currently enabled at the database level:

 

Invoke the following commands to enable database-level CDC. These commands use SQL Server’s built-in sys.sp_cdc_enabled_dbd stored procedure to perform the necessary updates:

USE AdventureWorksDW2019 GO EXEC sys.sp_cdc_enable_db GO

Re-invoke the verification commands from the start of this section to verify that is_cdc_enabled has is now set to 1:

 

Set up Table-Level CDC

In addition to setting up database-level CDC, you must also enable CDC on a per-table basis.

This section describes how to set up and verify table-level CDC on the AdventureWorks database’s DimAccount table.

Invoke the following commands to set up CDC on the DimAccount table. Note the source_schema parameter must be assigned the name of the schema to which the table (DimAccount) belongs, in this case dbo:

USE AdventureWorksDW2019 GO EXEC sys.sp_cdc_enable_table @source_schema = N'dbo', @source_name = N'DimAccount', @role_name = NULL GO

Verify that CDC is enabled for the DimAccount table by checking that is_tracked_by_cdc is set to 1 for the database in sys.tables.

Invoke the following command to return all tables listed in sys.tables:

USE AdventureWorksDW2019 GO SELECT object_id, SCHEMA_NAME(Schema_id) As [Schema Name], name As [Table Name], is_tracked_by_cdc FROM sys.tables GO

Locate the row for the DimAccount table and verify that is_tracked_by_cdc is set to 1:

This process results in the creation of a system table prefixed with cdc. called cdc.dbo_DimAccount_CT that can be seen in Object Explorer and further verified by querying the table.

Invoke the following command to verify that cdc.Dbo_DimAccount_CT can be queried and that a row is returned:

USE AdventureWorksDW2019 GO SELECT * from cdc.Dbo_DimAccount_CT GO

You have now successfully configured CDC for a database and table. 

Striim for High Speed, Reliable SQL Server CDC

Striim is a real-time data integration platform that natively performschange data capture by mining database change logs while managing additional metadata. Striim supports enterprise workloads with:

  • high-speed capture (more than 7x faster than the native SQL Server CDC feature)
  • exactly-once processing (E1P) to prevent data loss or duplication
  • support for long-running transactions
Striim SQL Server CDC

As shown in the diagram above, Striim’s SQL Server CDC Reader doesn’t require the use of a change table. Striim reads the change data from the SQL Server transaction logs; performs in-memory transformations, enrichment and analysis; and delivers data to target systems…with millisecond latencies.

Striim enables users to migrate and replicate data from SQL Server databases to cloud and on-premise data warehouses, data lakes, messaging systems, files, and big data targets. 

If you would like a demo of Striim, or to talk to one of our CDC experts, you can schedule a demo ortry Striim for free. 

Sours: https://www.striim.com/sql-server-change-data-capture-cdc-methods-how-striim-captures-change-data-faster/

Str tsql

SQL Server: STR Function

Example

Let's look at some SQL Server STR function examples and explore how to use the STR function in SQL Server (Transact-SQL).

For example:

SELECT STR(123); Result: '123' SELECT STR(123.5); Result: '124' (result is rounded because decimal places defaults to 0) SELECT STR(123.5, 5); Result: '124' (result is rounded because decimal places defaults to 0) SELECT STR(123.5, 5, 1); Result: '123.5' SELECT STR(123.456, 7, 3); Result: '123.456' SELECT STR(123.456, 7, 2); Result: '123.46' (result is rounded because decimal places is set to 2) SELECT STR(123.456, 7, 1); Result: '123.5' (result is rounded because decimal places is set to 1) SELECT STR(123.456, 7, 0); Result: '123' (result is rounded because decimal places is set to 0) SELECT STR(123.456, 7); Result: '123' (result is rounded because decimal places defaults to 0)
Sours: https://www.techonthenet.com/sql_server/functions/str.php
CAST() and CONVERT() in SQL Server

STR (Transact-SQL)

Applies to:yesSQL Server (all supported versions) YesAzure SQL Database YesAzure SQL Managed Instance yesAzure Synapse Analytics yesAnalytics Platform System (PDW)

Returns character data converted from numeric data. The character data is right-justified, with a specified length and decimal precision.

Topic link iconTransact-SQL Syntax Conventions

Syntax

Arguments

float_expression
Is an expression of approximate numeric (float) data type with a decimal point.

length
Is the total length. This includes decimal point, sign, digits, and spaces. The default is 10.

decimal
Is the number of places to the right of the decimal point. decimal must be less than or equal to 16. If decimal is more than 16 then the result is truncated to sixteen places to the right of the decimal point.

Return Types

varchar

If supplied, the values for length and decimal parameters to STR should be positive. The number is rounded to an integer by default or if the decimal parameter is 0. The specified length should be greater than or equal to the part of the number before the decimal point plus the number's sign (if any). A short float_expression is right-justified in the specified length, and a long float_expression is truncated to the specified number of decimal places. For example, STR(12, 10) yields the result of 12. This is right-justified in the result set. However, STR(1223, 2) truncates the result set to **. String functions can be nested.

Note

To convert to Unicode data, use STR inside a CONVERT or CAST conversion function.

Examples

The following example converts an expression that is made up of five digits and a decimal point to a six-position character string. The fractional part of the number is rounded to one decimal place.

Here is the result set.

When the expression exceeds the specified length, the string returns for the specified length.

Here is the result set.

Even when numeric data is nested within , the result is character data with the specified format.

Here is the result set.

See Also

CAST and CONVERT (Transact-SQL)
FORMAT (Transact-SQL)
String Functions (Transact-SQL)

Sours: https://docs.microsoft.com/en-us/sql/t-sql/functions/str-transact-sql

You will also be interested:

T-SQL string concatenation `'string' + str(integer)` introduces extra space character

Sorry for the somewhat trivial question, but why does

when entered into the Data Explorer return

instead of

?

According to Microsoft's documentation on T-SQL's operator,

should give

not

and according to the Data Explorer documentation, the SQL-flavor used in the Stack Exchange Data Explorer is indeed T-SQL.


Some additional experiments:

returns , without extra spaces (see EDIT below).

returns , also without spaces.

returns , so it doesn't treat digits specially or anything like that.


To me, it looks as if basic semantic compositionality principle is violated. What am I missing here?


EDIT The problem turned out to be the wrong assumption that

returns . It actually returns

but the spaces are ignored by the browser-based GUI.

Here is another example that demonstrates the problem more clearly:

seems to return

but it actually returns

as can be seen in this query:

which returns 13 (not 5 and also not 6). Many thanks @lad2025 for pointing this out.

So, it was mostly an "optical illusion" caused by a somewhat inaccurate representation of string-results in the browser.

Sours: https://stackoverflow.com/questions/50510567/t-sql-string-concatenation-string-strinteger-introduces-extra-space-char


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