easy sql query builder

When you use the ActiveReports Report Designer to design a report template in a recent project, you encounter a multilevel classification challenge: You need to summarize the sales amounts for all sales and subordinates in a department, because the hierarchy of subordinate levels is uncertain, so the way of stitching sub-queries is obviously not satisfying the requirements. After some experimentation, it is easy to solve this problem by using the CTE

Tags: query font condition Auto Compare Name table between title testThese two conditions placed in different places is very easy to confuse people, so often query out the inexplicable results, especially when the condition of the replica and the main table does not match, the following with a B table for example, I understand the simple. The first thing to under

=0;if (is_array($table)){foreach ($table as $key=>$val){$sql ="SELECT COUNT(*) FROM ".$GLOBALS['sdk']->table($key)." WHERE $val[where] = '$type' "; if (!empty($keywords)) { $sql.="AND $val[keyword] LIKE '%" . mysql_like_quote($keywords) . "%' "; }$sql .="AND user_id = '$user_id' ";$info += $GLOBALS['db']->getOne($

Original http://blog.csdn.net/guoxuepeng123/article/details/8604715 1. the query conditions are accurate. Ii. SQL logic execution sequence From --> join --> where --> group --> having --> distinct --> order --> top Iii. Horizontal Query required fieldsWhen connecting multiple tables in an SQL statement, use th

1. the query conditions are accurate. Ii. SQL logic execution sequence FROM --> JOIN --> WHERE --> GROUP --> HAVING --> DISTINCT --> ORDER --> TOP Iii. Horizontal Query required fieldsWhen connecting multiple tables in an SQL statement, use the table alias and prefix the alias on each Column, this reduces the parsing

I put the question on the StackOverflow, but I didn't answer it. Write it yourself.My need is to show MySQL slow queries on the page. But if the original show, will take different parameters, not very good group and so on. The only thing we care about is SQL itself, like--These two are actually a slow query .Select * fromAwhereA>1 andB='R' andC=3;Select * fromAwhereA>2 andB='x' andC=5;--I want to be a

There is such a requirement that it creates an SQL Server query, including the cumulative value based on the event time. A typical example is a bank account, because every time you save and withdraw money at different times. For any account, you must calculate the sum of the loan (deposit) and loan (withdrawal) at a certain point in time. After each transaction, you want to know the current balance. List A

There is a requirement that it create a SQL Server query that includes cumulative values based on the event time. A typical example is a bank account, because you are saving and taking money at different times each time. For any account, at a point in time to calculate its borrowing (deposits) and credit (withdrawal) of the sum. After each transaction, you want to know the current balance. List A creates a

$login = "root";$passwd = "MySQL tutorial";try{$db =new PDO (' Mysql:host=localhost;dbname=mysql ', $login, $passwd);foreach ($db->query (' SELECT * from Test ') as $row) {Print_r ($row);}$db =null;}catch (Pdoexception $e) {echo $e->getmessage ();} Look at a higher level of $dbms = ' MySQL '; Database type Oracle with ODI, for developers, using a different database, just change this, do not have to remember so many functions$host = ' localhost '; Da

, BuniessStatus2tinyint, BuniessDateTime1Datetime, BuniessDateTime2Datetime, OtherColumn1varchar50), OtherColumn2varchar50), OtherColumn3varchar50))Declare@iInt=0While@i1000000BeginInsertIntoBusinessinfotableValues(NEWID (),NEWID (),NEWID (),NEWID (),RAND ()*100,rand () *100dateadd (Mi,@i, GETDATE ()), dateadd (Mi,@i, getdate ()), newid (), NEWID (), newid ()) set Span style= "color: #008000;" >@i=@i+1end Now there is a query (actually the

Multiple SQL tables query and computing statistics code based on ACCESS and ASP, accesssql Recently, I am writing a few management systems about "Project-Subitem-Task", saying that the system is a bit exaggerated. It is basically a multi-Table query call and database operations of insert and update, the SQL statements

trySelect min (FID), name,sex from table group by nameSuccess, the reality of the following results:FID name Sex1 a male2 b Male3 C Female4 D FemaleContinue thinking, if you want to open all records, do not specify a field (*), it seems that this method is not!SELECT * FROM table where FID in (Select min (FID) from table group by name)Test successFID name Sex1 a male2 b Male3 C Female4 D FemaleProgramme III:It was already over, and suddenly remembered the last few days on the internet to check

Label:1. Computed ColumnsSELECT * FROM EMP--* indicates that all--from EMP represents the query from the EMP table for select Empno,ename from EMP; Select Ename,sal*12 as "annual salary"From EMP--as can be omitted, remember "annual salary" do not write ' annual salary ', also do not write annual salary,Easy to transplantSelect Ename,sal*12 as "annual salary", Sal "monthly salary", Job from EMP select 5 from

the database (that is, files on the hard disk)The data in the disk can only be achieved through the instance, and files on the hard disk cannot be directly read. Differences:An instance can operate databases. At any time, an instance can only be associated with one database. In most cases, only one instance can operate on a database. 3. Note The SQL language is case insensitive, but the words in the where or having condition quotation marks are case

Like fuzzy query for oracle, mysql, db2, and SQL server in Mybatis, mybatisdb2 Different database languages: SQL server, Oracle, mysql, db2'' There are too many database system types. To put it simply, ACESS is suitable for small websites. asp and MYSQL are recommended for new websites. SQL Server is suitable for med

My problem is as follows: There is a table t, field c1, c2, c3, c4, which requires a random selection from the repeated values of c1 to form a result set. How to implement it? For example, the record is as follows: Aa1 bb1 maidAa1 bb2 cc2 dd2Aa1 bb3 cc3 dd3Aa2 bb4 cc4 dd4Aa2 bb5 cc5 dd5Aa2 bb6 cc6 dd6..... The result is that a record is randomly selected from the value aa1, and a record is randomly selected from aa2. So on, the result set is obtained. How can I use a single

Tags: SQL Server database queriesRecently has been studying the blog, in fact, is now a popular self-media, it is interesting that the netizens have written their own blog, the establishment of a small station, and now went to the platform for others to work free, but also enjoy themselves, do not know what the situation.Blog information:Topics: Learning topics related to reading notes.Web site: Use a. NET domain name as a URL, for example骆驼祥子好词好句http

database waits for the receiving client to send the network packet and sends the network packet to the client, this parameter is valid only for threads in the Activity state.JDBC setQueryTimeout function:To avoid endless query or long time, and cause thread blocking, stmt is used after obtaining the Statement instance. setQueryTimeout (10); Avoid thread blocking caused by queries.But yesterday it was found that the program encountered an exception, "

is the timeout time when the database waits for the receiving client to send the network packet and sends the network packet to the client, this parameter is valid only for threads in the Activity state.JDBC setQueryTimeout function:To avoid endless query or long time, and cause thread blocking, stmt is used after obtaining the Statement instance. setQueryTimeout (10); Avoid thread blocking caused by queries.But yesterday it was found that the progra

(actually the query is far more complicated than this, I simplify a little, do not say that I deliberately built the environment) Select OtherColumn2, BuniessStatus1, BuniessStatus2, BuniessDateTime1, BuniessDateTime2 From Businessinfotable where BuniessDateTime1 between ' 2016-6-21 ' and ' 2016-6-28 ' and BuniessDateTime2 Between ' 2016-6-21 ' and ' 2016-6-28 ' and BuniessStatus1 =