decode statement in sql

In php, an SQL statement is too long. during The debugging, it is found that the SQL statement has become incomplete and PHP experts can solve the problem for me: An SQL statement is defined in php as follows: $

Common SQL statement optimization skills (1) and SQL statement optimization skillsTo improve the efficiency of SQL statement execution, the most common method is to create an index and avoid full table scan. We will organize some

PHP implementation of constructing SQL statement class instance, constructing SQL statement instance This article describes the construction SQL statement class implemented by PHP. Share to everyone for your reference, as follows

SQL statement optimization in the 2014 summary, and SQL statement in the 2014 Summary I took over a small program for data statistics processing. It was logically nothing, but the data volume was a little large. Some tables had tens of millions of data .. because it is statistics, it is inevitable to connect various qu

Date formatting statement and SQL Server statement during SQL Server Query The default datetime format of the Chinese version of SQL Server isyyyy-mm-dd Thh:mm:ss.mmm For example: select getdate() 2004-09-12 11:06:08.177 I sorted out the date format conversion methods tha

Today I wrote a small program, small and small, just to build a link between PHP and MySQL, and implement simple SQL statements. Novice preliminary interview, but also please a lot of experts to guide the road. The program source code is as follows: Copy the Code code as follows: $conn = mysql_connect ("localhost", "root", "") or Die ("wrong!");$sel =mysql_select_db ("MyDB", $conn);$sql = "INSERT into

Mysql master-slave backup and SQL statement backup, mysql master-slave SQL statement The master-slave configuration of the MySQL server is a very simple task. Instead of starting from scratch, it is always on the mysql server that has been installed by others. This will involve the mysql version, startup File and other

(j.home_day1) and To_days (Str_to_date (pi.date2, '%d/%m/%y ')) But the queried data is empty, when the mode is found, passed to $query = mysql_query ($sql); here's the SQL statement: SELECT * from P_info Pi left JOIN job J on j.id = 734WHERE Pi.requestid = 0 and ((Ifnull (pi.standard_20_ft_container, 0)-ifnull (J.standard_20_ft_container, 0)) and ((Ifnull (pi.s

The SQL statement cyclically processes the data of the current row and the data of the previous row plus or minus, and the SQL statement In the following example, we use a cursor to cycle the data in Table # temptable, and then add argument1 in the current row and the previous row to the argument2 in the current row, w

Mysql-amp; gt; SQL statement to delete duplicate data bitsCN.com Mysql-> SQL statement: delete duplicate data A question frequently asked during the interview: an SQL statement is used to delete duplicate data in the table. Occa

SQL statement, mysql database, SQL statement mysql SQL statement to insert data in one table and specific data (fixed constants) into another table insert into wm_jobpoint_allstatus(CODE,pointstatus,housestatus,roomstatus,workstat

PHP constructs an SQL statement instance and an SQL statement instance. This example describes how to construct an SQL statement class implemented by PHP. We will share this with you for your reference. The details are as follows:

of the object so that the object definition does not change during the analysis of the statement.Check whether the user has the corresponding operation PermissionsDetermine the statement execution planSave the statement and execution plan to the shared SQL zone. 4. Use? Parameter format:Try not to use the concatenation string method, because there is? The analys

SQL Server loop statement insert, SQL Server loop statement There is a table tt Description: Q (PK, int, not null) w (nchar (10), not null) e (int, not null) r (int, not null) t (int, not null) y (int, not null) u (int, not null) I (int, not null) o (int, not null) p (int, not null) The circular insert

The SQL statement is used to query the Index usage and the index status of the SQL statement. SELECT sch.name + '.' + t.name AS [Table Name], i.name AS[Index Name], i.type_desc, ISNULL(user_updates,0) AS [Total Writes], ISNULL(user_seeks +user_scans + user_lookups,0) AS [Total Reads], s.last_user_seek, s

Mandatory SQL statement (6) Data Query and SQL statement Data Query 1. Basic Query1) rename a columnSelect name as 'name' from Table name2) define constant ColumnsSelect = 'is 'From table name3) top usage: percent-- In this way, you can obtain the first 20% fields.Select top 20 percent * from Table Name4) Remove duplic

a joins Dept b on (a.deptno = B.deptno) Order BY empno Desc;To sort by an alias of a field or an expressionSelect A.ename,a.mgr,a.empno, (a.sal*12) as annsal from EMP a order by annsal;1.5 GroupingSelect B.deptno,b.dname,sum (a.sal)From EMP a,dept bwhere A.deptno=b.deptnoGROUP BY B.deptno,b.dnameORDER BY B.deptno DescFields after GROUP by = ALL display fields except aggregate functions in the select listThe total wage, the number of people, the maximum wage, the minimum wage, the average wage o

SQL statement and database optimization, SQL statement database Optimization1. Unified SQL statement writing For the following two SQL statements, the programmer thinks they are the sam

Java SQL statement optimization experience and PostgreSQL statement Optimization Java SQL statement optimization experience (1) select the most efficient table name sequence (only valid in the rule-based seo/'target = '_ blank'> Optimizer ):The ORACLE parser processes the ta

Access to Create a Table SQL statement Create Table to set AUTOINCREMENT for Automatically increasing columns, SQL statement createtable Access Table creation SQL statement Create Table setting AUTOINCREMENT for Automatically incr