sql string manipulation

Text: string manipulation in SQL Drip 33-sqlCalculating string LengthsLen () is used to calculate the length of a stringSelect sname,len from studentConvert string to large, lowercaseLower () is used to convert a string to lowercase, and upper () is

Character function--return character valueThese functions all receive parameters of the character family type (except CHR) and return the character value. In addition to the special instructions, most of these functions return a numeric value of

1, go to the space function(1), LTRIM () remove the space at the head of the string.(2), RTRIM () remove the space at the tail of the string.2. Character conversion function(1), ASCII ()Returns the ASCII value of the leftmost character of a

Http://www.cnblogs.com/jiajiayuan/archive/2011/06/16/2082488.htmlFor example, all of the following are examples of studnet tables:Calculating string LengthsLen () is used to calculate the length of a stringSelect Sname, Len (sname) from

--Aliases and expressionsSelect Orderdate,year (OrderDate) as order yearFrom orders;--SelectSelect Orderdate,year (OrderDate) as order yearFrom OrdersWhere year (OrderDate) = 2006;--in the case of grouping, the select sentence will have a limit, can

There must be a case in SQL Server where the values of a column in a table are stitched together into strings, "," or other symbols, which we would normally do:declare @returnValue nvarchar (max) = ";Select @returnValue + = ', ' +col1 from Table1

2017.11.17Seven. Inserting, updating and deleting data:1. Insert data into the table:Inserting using the INSERT statementThe traditional INSERT statement basic syntax format:Insert into table name values (value 1, value 2,...)You can also specify a

concat (' Hello ', ' world ')     stitching             HelloWorld substr (' HelloWorld ', 1,5)   intercept Hello Length (' HelloWorld ')         string length ten InStr ('

Copy CodeThe code is as follows: Class mysql{Function Connect ($dbhost, $dbuser, $DBPW, $dbname = ', $dbcharset = ') {if (! @mysql_connect ($dbhost, $dbuser, $DBPW)) {$this->show (' Can not connect to MySQL server ');}if ($dbname) {$this->select_db

Using Servlet, JSP and JDBC to implement database manipulation--jdbc connect MySQL instance: Put the MySQL database-driven package (my driver Mysql-connector-java-5.1.34-bin.jar, which needs to be downloaded separately) in the Web-inf->lib