![]() So for ASCII character strings that use 1 byte per character, the LEN and DATALENGTH() should be equal. ![]() The DATALENGTH() function tells you the number of bytes used to make a character string. It is not mentioned in the Microsoft Technet article and it is not very intuitive. I put that in bold and italics for a reason. The LEN() function gives you the number of characters in a character string but it trims the trailing empty spaces. Using LEN()/DATALENGTH() to find leading and trailing spaces Let’s investigate a couple of methods in which to find out what is happening in these strings. I will discuss this in a bit more detail later. For example: are stings case insensitive or not (is "ZombieLand" = "zombieland"?) or are a string’s accent sensitive or not (is Ça = Ca). Collation is SQL Server’s way of knowing how to sort and compare data. There is however some basic things you should know. If you need further information here is a good place to start. CollationĪ full examination of collation is out of the scope of this article. This means the column is case and accent sensitive. One last thing, the collation of the THE_TEXT is Latin1_General_CS_AS. This particular error/issue will come up later. It has multiple spaces between “Zombie” and “Land”. I created character expressions with spaces at the beginning and end as well as added special characters (“/”,”#”) in the middle. ('ACCENTS','Régie du logement - Gouvernement du Québec'),Īlso, look at a number of the problems. ('SPECIAL CHARACTERS MULTIPLE SPACES','35 Zombie Land Apt 13'), ('SPECIAL CHARACTERS \','This and\or that'), ('SPECIAL CHARACTERS /','This and/or that'), ('SPECIAL CHARACTERS - # SYMBOL','35 Zombie Land Apt. ('SPECIAL CHARACTERS - APOSTROPHE','Zombie''s Land'), ('SPECIAL CHARACTERS - CARRAGE RETURN LINE FEED','Zombieland' + CHAR(13) + CHAR(10)), ('SPACE AT START AND END', N' Zombieland '), ,THE_TEXT NVARCHAR(60) COLLATE Latin1_General_CS_AS IF (SELECT OBJECT_id(N'TEST_DATA','U')) IS NOT NULL So the “EXAMPLE_TYPE” can be “SPACE AT END” and “THE_TEXT” has a piece of text with a space at the end (‘Zombieland ‘). The first column is a description of the key component we are looking at in the 2 nd column. The script below will create a table with 2 columns. What I do is run them against the data every morning and send out emails to those responsible so they can correct them before the issue starts to manifest. Over the years I have compiled a small library of queries that I hope you will find as useful as I have. The reality is that even if you have a great deal of control over the data, this stuff always sneaks in. These issues manifest as odd characters on a report, off center titles, screens not opening, orders failing to get created and the list goes on. In addition many times the errors associated with the problem have nothing to do with identifying the character, but are related to the issue it is causing. When working with multiple source systems wouldn't it be nice if everyone could agree on what characters were acceptable. In this tutorial, we have discussed how to replace strings using PostgreSQL replace() and regexp_replace functions and how the replace() function can be used to update strings in a table.Special characters are one of those necessary evils. UPDATE demo SET text = replace( text, 'Red', 'Yellow') UPDATE demo SET text = replace( text, '-', '_') UPDATE demo SET text = replace( text, 'red', 'yellow') -view all the changes INSERT INTO demo ( text) VALUES ( 'She bought a red bag'), ( 'Green is a good color'), ( 'The sky is blue'), ( 'The color of the shirt is red'), ( 'They plan to go with blue or red balloons') -update statements that include the REPLACE function ![]() INSERT INTO demo ( text) VALUES ( 'Red'), ( 'Green'), ( 'Blue'), ( 'Red'), ( 'Red') -insert second set of records CREATE TABLE demo ( id INTEGER PRIMARY KEY GENERATED ALWAYS AS IDENTITY, text TEXT NOT NULL ) -insert first set of records ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |