how to query database

Take a look at the paging SQL of a single SQL statement first. Method 1: Applies to SQL Server 2000/2005 Select Top Page Size * FROM table1 WHERE ID: (SELECT top Page Size * (page-1) ID from table1 ORDER by ID Method 2: Applies to

$id =isset ($_get[' id ')? $_get[' id ']: ';if (!is_numeric ($id)) {Exit ("Sorry, the user you visited ");}else{ $sql = "SELECT * from Wk_member where id= ' $id '";MySQL tutorial _query ("Update wk_member set m_hit=m_hit+1 where id= ' $id '");

The code is as follows Copy Code SELECT keyword, COUNT (*) as CountFrom Article_keywordGROUP by keywordOrder BY Count DESCLIMIT 20 This query statement returns 20 records with the most keyword repeat count (count) in the

It is useful to query all records for this quarter based on the current date. Here are two SQL statements for access quarterly query records for your reference. 1, querying all records for the current quarterSELECT * FROM news where DATEPART (' Q ',

$result =m ('sale_lead ') ->field (' Lead_source,created_by,count (sale_lead_id) as Count_num ' ) ->group (' lead_source,created_by ') ->where ($where) ->select (); Results: array {[0] => Array (3) {["Lead_source"] =>

Turn from: http://tong7858-126-com.iteye.com/blog/829323 1. In versions above Oracle8, you can use the following statements to index names and queries that create INDEX statements.SELECT index_name,dbms_metadata.get_ddl (' INDEX ',

Select T.table_name,t.num_rows from User_tables t If the above SQL is not found, execute the following script:>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>Create or Replace function count_rows (table_name in VARCHAR2,Owner in varchar2

Data | database Dim Rs,sql,x_name,x_pwd,x_countIf Request.Form ("do") = "OK" ThenIf Request.Form ("user_name") = "" ThenResponse.Write (" ")Response.End ()ElseX_name = Request.Form ("user_name")End If' ↑ The Renegade username is empty!If

Data | database Dim Rs,sql,x_name,x_pwd,x_countIf Request.Form ("do") = "OK" ThenIf Request.Form ("user_name") = "" ThenResponse.Write (" ")Response.End ()ElseX_name = Request.Form ("user_name")End If' ↑ The Renegade username is empty!If

The average person may use list.size or list==null to make judgments. The type returned when there is no return value is "[]" and it is not empty and has no elements, so using ==null and if (List.size () >0) {//Business logic} is unsuccessful.So

Today encountered a problem is to bulk update the value of a field in the database, you need to find out which table contains this field, organized the following statement to facilitate querySELECT

But the official website does not use the tutorial, oneself groped out, has the wrong time everybody points out to Oh, the common progress ~First is the configuration: modules\database\config\database.phpMultiple database configurations can be

Method One: Select ' Name ' from Mysql.proc where db = ' your_db_name ' and ' type ' = ' PROCEDURE '//stored procedure Select ' Name ' from Mysql.proc where db = ' your_db_name ' and ' type ' = ' function '//function Method Two: Show procedure

This article illustrates the method of Php+mysqli database query using preprocessing technology. Share to everyone for your reference. Specifically as follows: The code has some difficulty, needs the basic knowledge to be able to understand better,

Unit Querythread Interface Uses Classes,messages,adodb,db,sysutils,dialogs,activex; Type Tmythread = Class (TThread) Private Fquery:tadoquery; Inquire Fconnection:tadoconnection; Connection Fdatasource:tdatasource; {data-aware component

Title: Identify the employee's name, salary, department number, and average wage in the department above the average wage in the department The structure of the table (table name is Sqltest)1, first find out the average wage of each department

※ The relationship between table and table 1, a one-to-one need of two tables. Of course, in order to save space for the project, usually only a table, if you want to achieve one-to-one query, you can build two views. The example is as follows: 1

Whether a table config exists in the query in Sqlite3: Select COUNT (*) from ' sqlite_master ' where type = ' table ' and tbl_name = ' config ';If the table exists, the return result is greater than 0, and if it does not exist, the return result

Reference: Click to open link 1. Group BY & Order BY & Q Aggregation + ordering, the corresponding SQL statement is: Select Currentpid, COUNT (*) from stats_x where type=3 and (status =1 or Status=0) GROUP BY Currentpid ORDER BY currentpid

User table is usually we write "XX Management system" project must be used, in some cases the classification of people belong to the tree structure, that is, in addition to the highest level and the lowest layer, the middle layer has a relative