sql trim string

lowercase letters SELECT LOWER (' abc ')--ABC Left (S,n)Returns the first n characters of a string s SELECT left (' ABCDE ', 2)--AB Right (S,n)Returns the second n characters of the string s SELECT right (' ABCDE ', 2)--DE LTRIM (s) remove the space at the beginning of the string sRTRIM (s) remove the space at the end of the

String drop table if exists category; CREATE table if not EXISTS category ( C_ID bigint NOT NULL, C_name varchar (255) Default ', C_type int default 1, Primary KEY (C_ID) ); drop table if exists files; CREATE table if not EXISTS files ( f_id bigint NOT NULL, C_ID bigint NOT NULL, F_name varchar (255) Default ', F_mids text, Primary KEY (F_ID) ); Drop table if exists members; CREATE table if not EXISTS members ( m_id bigint NOT NULL, M_name varchar (

Recently, the date and time format conversion was used to design the database table structure. After a long time, I had to worry about it for a long time. I found that I forgot a lot of things I learned before. It seems that it is easy to forget that it is not commonly used. Repeat the SQL Server date and time format conversion string. In the SQL Server database,

Grammar REPLACE (' String_expression1 ', ' string_expression2 ', ' String_expression3 ') Parameter description ' String_expression1 ' The string expression to search for. String_expression1 can be either character data or binary data. ' String_expression2 ' The string expression to find. String_expression2 can be either character data or binary data. ' String_expression3 ' The

+ 08:Afternoon 00Sql> alter session set time_zone= ' -11:00 ';The session has changed.Sql> Select Localtimestamp,to_char (sysdate, ' dd-mm-yyyy HH:MI:SS AM ') "Sysdate" from dual;Localtimestamp sysdate---------------------------- ------------------------December-November-03 05.11.31.259000 13-11-2003 12:11:31 pmAfternoonSql>8, Months_between () determine the number of months between two datesNumber_value:=months_between (Date_value,date_value)Sql> Se

One: The value of the field of the query string type is NOT NULL for SQL:[SQL]View Plaincopy SELECT * from tb_cms_flgtinfo_a t where (T.fsta are not null and t.fsta '); Main: The above tb_cms_flgtinfo_a is the table name, Fsta is the field in the tableTwo: The query string Type field has a null value f

function | string T-SQL is less capable of handling strings, such as I'm looping through strings like 1,2,3,4,5, and if you use arrays, traversal is simple, but T-SQL does not support arrays, so it's tricky to handle. The function below implements the processing of strings like an array. First, use a temporary table as an array create function f_split (@c varchar

F_split: Splitting a string into a data table Create FUNCTION [dbo]. [F_split] (@SplitString nvarchar (max),--source string @Separator nvarchar (10) = "--delimited symbol, default to space) RETURNS @SplitStringsTable table-Output datasheet ([id] int identity (), [value] nvarchar (max)) as BEGIN DECL is @CurrentIndex int; DECLARE @NextIndex int; DECLARE @ReturnText nvarchar (max); SELECT @Cu

SQL native client ODBC driverStandard secure connectionDriver = {SQL native client}; server = myserveraddress; database = mydatabase; uid = myusername; Pwd = mypassword;Are you using SQL Server 2005 Express? Use the connection expression "host name \ sqlexpress" in the "server" option ".Trusted connectionDriver = {SQL

, if you have some data from several tables-they cannot be joined to a query, then you have multiple connections-each connection has a command associated with it to read the data. Similarly, if you are writing data to a table, you need another connection or connection set-if more than one table is to be updated. For example, the following code Multipleactiveresultsets=true opening a Join String connstr = "server= (local);d atabase=northwind;integrated

ado.net Connecting to SQL Server The SQL Server. NET Framework Data Provider supports a connection string format similar to the OLE DB (ADO) connection string format. Copy Code code as follows: using (SqlConnection connection = new SqlConnection (connectionString)) { Connection. Open (); Do work

What should I do if I need to filter the scores in the middle of an SQL string field? The following describes how to filter records of the central score of an SQL string field for your reference. For example, there is a KKBH (bayonet number) field, which is a dictionary field (corresponding to the number field of anoth

========================================================== ============ What is the difference between exec @ SQL and exec (@ SQL )? When I use exec @ SQL In the stored procedure, the following error occurs: SERVER: Message 203, level 16, status 2, row 9Name: ''select AA. xsh, AA. jfqj, isnull (......However, exec (@ SQL