robomongo query

Tags: nbsp color cal pos Col cores core round. ClassLeftist query SELECT * from a LEFT join B on a.id=b.id; Right Union query SELECT * from a RIGHT join B on a.id=b.id; inline query Select A.name,b.class from A, b where c.id=b.id; ORDER BY Select *from a order by Desc#desc; descending arrangement, ASC ascending order GROUP BY Select COUNT (scores) from the group

Label:Transferred from: http://www.cnblogs.com/likwo/archive/2010/04/16/1713282.htmlQuery Day: SELECT * FROM table where to_days (column_time) = To_days (now ());SELECT * FROM table where date (column_time) = Curdate (); Query one week: SELECT * FROM table where Date_sub (Curdate (), INTERVAL 7 day) Query one months: SELECT * FROM table where Date_sub (Curdate (), INTERVAL 1 MONTH) MySQL

The main query is to determine the main table of the query, and the secondary table.In this case we can confirm that it is a subquery.The main table is our student table: Tblstudent can find the student's school number, nameThe auxiliary table is the score table, TblscoreWrite your own statement as follows:SELECTTblstudent. Stuid,tblstudent. Stuname,xuankeshu.kscount,kccj.countscore fromTblstudent, (SELECT

position, D.dname department name, Dtemp.Countnumber of departments, S.grade wage level fromEMP e,emp m,dept D, (SELECTDeptno DNO,COUNT(empno)Count fromEMPGROUP bydeptno) Dtemp,salgrade sWHEREE.sal>(SELECT AVG(SAL) fromEMP) andE.mgr=M.empno (+) andE.deptno=D.deptno andDtemp.dno (+)=D.deptno andE.salbetweenS.losal andS.hisal--61m-----Number of people using this wage levelSELECTS1.grade SG,COUNT(E1.empno)Count fromEMP e1,salgrade S1WHEREE1.salbetweenS1.losal andS1.hisalGROUP byS1.grade--Seventh

{Code ...} SELECT * FROM 'subobject' WHERE Subject_id IN (1602509) OR 1 = 1 LIMIT 5. for example, if the database contains a record Subject_id = 1602509, I want to query five records IN the result set, what should I do if it contains the record Subject_id = 1602509 ?? If there is no Subject_id = 1602509 record, use other data to complete 5 records. Reply content: SELECT * FROM 'subobject' WHERE Subject_id IN (1602509) OR 1 = 1 LIMIT 5. for example,

1. persondao The full persondao code is as follows: package com.njupt.sqllist;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;public class PersonDao {DBOpenHelper helper ;public PersonDao(Context context){helper = new DBOpenHelper(context);}public void insert(Person p){SQLiteDatabase db = helper.getWritableDatabase();db.execSQL("insert into person(name,balance) values(?,?)", new Object[]

Summary: Spring Data JPA is actually a dynamic proxy for JDK mode (requires an interface with a whole bunch of top-repository interfaces from Org.springframework.data.repository,There are crudrepository interface and an implementation class Simplejparepository), as long as there is an interface can query the database, in fact, is the proxy method, the specific query method has twoOne is simply the method na

database query, query the number or English can, query Chinese error: Prompt????????????: SELECT * from Szdbdb_userdata where truename= '???? 'Illegal mix of collations (gb2312_chinese_ci,implicit) and (latin1_swedish_ci,coercible) for operation ' = ' 12670Workaround: The general online will say is the encoding problem, in the configuration file My.ini modify the

Label:Tool Recommendation: Robomongo, can self-Baidu to find the source of download, personal comparison recommended this tool, compared to Mongovue is more flexible.Collection Simple Query methodMongoDB syntax: Db.collection.find ()//collection is the name of the collection, which can be created on its own.Compare SQL statements: SELECT * FROM collection;Queries all the documents in the collection, that is

The last time we mentioned that not using the Left-loin Association query, it might be to improve efficiency or to configure caching, or to simplify the writing of SQL statements. Just write a single-table query, SQL is really too simple. The problem is that querying data for multiple tables is still very much needed.So there is a strong need to query 2 collectio

columnLine DEPTNO dname LOC------- ---------------------------- --------------------------Ten ACCOUNTING NEW YORKDALLASSALES CHICAGOOPERATIONS BOSTONOracle Common data types:Numeric number (effective length, number of decimal places reserved); Lift: Number (10,2) 12345678.12CharacterVariable-length character varchar2 (effective length) lifting chestnut: varchar2 (5) ' ab ' actually exists ' AB 'VARCHAR2 (5) ' ABCDE ' Save up to 5Immutable length character char (effective length) Li: char (5) '

Today with MyBatis query statements, the console output of the SQL statement can be executed in Plsql, but the query is no data.The original query statement is as follows: (for privacy, the sensitive package name to the mosaic.) ）This SQL can be executed correctly in Plsql, but the data cannot be queried.The workaround is to replace "#" in the

0. Stored procedure start variable definition@FBeginDatevarchar10),--Document Start date@FEndDatevarchar10),--Document due date. @FItemID varchar (50), @FItemID2 50 @FCust varchar (50), @FCust2 varchar ( 50varchar (1. Date range Queryand t.fdate>=@FBeginDate andt.fdate@FEndDate='2100-01-01end 2, Customer code range queryand T11. Fnumber>=@FCust andT11. Fnumber@FCust2= then(end 3. Item Code Range Queryand T14. Fnumber>= andt14. Fnumber@FItemID2= then(end 4, Document type fuzzy

Tags: nesting requires strong charset any condition query score list StudentsOne: Connection query: Connection query is to connect two or more tables according to a certain condition, select the required data, the connection query query two or more tables at the same time, w

Hibernate (9) HQL query and hibernatehql QueryI. query methods provided by Hibernate OID query method: Primary Key query. The get () or load () method is used to load the specified OID object and the query result is HQL Query m

OPEN INFOREB SEARCH QUERY logsmation EXTRACTION fromWEBSEARCH QUERY LOGSChapter I.IntroductionSearch engines are increasingly more advanced than traditional keyword input and document output, and by focusing on user-oriented tasks to improve user experience, user-facing tasks include query suggestions, search personalization, referral links. These user-centric t

MySQL Slow Query Log (Slow Query Log), mysqlslow Like most relational databases, log files are an important part of MySQL databases. MySQL has several different log files, such as error log files, binary logs, common logs, and slow query logs. These logs help us locate the internal events of mysqld, database performance faults, record the change history of data,

The previous article discussed in detail the HQL query in the Entity object query, and at the end of the simple introduction of SQL Native Query, HQL is the object query, so in the Query method and SQL may not be the same, in learning to use HQL only need to understand the d

Use pt-query-digest to find the SQL statement that is not suitable, pt-query-digestsql Overview of pt-query-digest1. Indexes can be executed more quickly, but there must be unreasonable indexes. If you want to find those indexes that are not very suitable and optimize them before they become problems, you can use the pt-query