sql etl examples

Examples of non-cyclic recursive queries in the SQL Server tree table, tree Recursion Many people may want to query the content associated with the entire tree-like table through recursive loops... in fact, Microsoft can use other syntaxes in SQL2005 or later versions. The following is an example. -- Query the parent node with tree as (SELECT * FROM Areas WHERE id = 6 -- the child id to be queried union all

The examples in this article describe SQL Server triggers and transaction usages. Share to everyone for your reference, specific as follows: Add and remove triggers Alter TRIGGER TRI_TC on T_c to Insert,delete as begin set XACT_ABORT on declare @INSERTCOUNT int; Update triggers and transactions Transactions are primarily used for data protection, and when multiple tables are updated, th

+a_salary. 4. write the UPDATE statement "update originsalary set o_salary=" add Value "where o_id=" Get Value "5. Cycle 3 times to complete this function. Another way is to write a stored procedure, which I will not list here. I want you to think about this before learning about cursors, and some examples of batch processing. Some people might say, "Can't the database handle data in one row?" Addsalary the data of the table into rows, and then the t

, thus obtains the desired data successfully, is the master and "rookie" the fundamental difference.According to national conditions, the domestic website with asp+access or SQL Server accounted for more than 70%, php+mysq accounted for 20%, the other less than 10%. In this article, we from the sub-entry, advanced to high-level to explain the ASP injection methods and techniques, PHP injection of the article by the NB Alliance, another friend Zwell wr

Examples of SQL subqueries 1. Single Row subquerySelect ename, deptno, SalFrom EMPWhere deptno = (select deptno from Dept where loc = 'New York '); 2. multi-row subquerySelect ename, job, SalFrom EMPWhere deptno in (select deptno from Dept where dname like 'a % '); 3. Multi-column subquerySelect deptno, ename, job, SalFrom EMPWhere (deptno, Sal) in (select deptno, max (SAL) from EMP group by deptno );

Tags: SQL Server tables, views, indexesFirst, the table related1. Create Use[test] Go setansi_nullson go setquoted_identifieron go CREATETABLE[dbo] . [Ceshi] ([Id][int]notnull, [Name][varchar (]null), CONSTRAINT[PK_Ceshi] primarykeyclustered ([Id]asc) with (Pad_index=off,statistics_ norecompute=off,ignore_dup_key=off,allow_row_locks=on, Allow_page_locks=on) on[primary] on[primary] GO--add field comment EXECsys.sp_ addextendedproperty @nam

The examples in the books I read when I used to learn connection queries have no practical significance. I just put two tables together and only understood the syntax, but I don't know why I used connection queries, what are the benefits of connection query. Recently, when I was studying Hibernate and reviewing SQL, I thought of a particularly good case (experience: it is difficult to learn

list of students, the place of origin, the form of the student's hometown province, but also some other students of the province of origin. If you only ask which province you can write:23. find out the names of all the students who have enrolled in all coursesSome students above the SQL statement may not understand, the following is a link, point Open has a detailed explanation, to understand helpful https://zhidao.baidu.com/question/258791372.htmlqb

Label:reading: SQL Storage is an important part of the database operation process, for some beginners is also more abstract difficult to understand, this article I will use a few examples to parse the database of SQL stored procedures, so that the abstract things visualized, more easily understood. Example 1: Create proc Proc_stu@sname varchar (20),@pwd varchar (

Tags: style blog color sp on data div log BS--------------------------Examples of Oracle database paging SQL------------------------------------------------SELECT * from ( SELECT TEMP.*, ROWNUM asNUM from ( SELECTEB. Ehr_id,eb. Person_name,cl. svc_id A,bill. svc_id B,bill. Item_name fromPhis. Ehr_base EB, Phis. Svc_clinic Cl,phis. Svc_clinic_bill BILL .WHEREEb. ehr_id=CL. ehr_id andC

reading: SQL storage is an important part of the database operation process, for some beginners is also more abstract difficult to understand, this article I will use a few examples to parse the database of SQL stored procedures, so that the abstract things visualized, more easily understood. Example 1:create proc proc_stu @sname varchar ( -), @pwd varchar ( -)

Usage of distinct in SQL (four examples) and sqldistinct When using mysql, you sometimes need to query records with unique fields. Although mysql provides the keyword distinct to filter out redundant duplicate records, only one record is retained, but it is often used only to return the number of records that do not repeat, rather than to return all values that do not record the record. The reason is that d

SQL Server uses table values as input parameter examples in stored procedures. If we want to pass the table as an input parameter to the SQL Server Stored Procedure before 2008, we may need a lot of logic processing to pass the table data as a string or XML. Table value parameters are provided in 2008. Using Table value parameters, you can send multiple rows of

]AsPARTITION [Partitionfunc]to ([Y2015], [Y2016], [Q1], [Q2], [Q3], [Q4], [PRIMARY])CREATEPARTITIONFUNCTION [Partitionfunc] (datetime)Asrange RIGHT for values (n ' 2016-01-01t00:00:00.000 ', n ' 2017-01-01t00:00:00.000 ', n ' 2017-04-01t00:00:00.000 ', n ' 2017-07-01t00:00:00.000 ', n ' 2017-10-01t00:00:00.000 ', n ' 2018-01-01t00:00:00.000 ') The partition records are as follows: If the partition changes relatively large does not recommend the method of merging and deletion, because error pr

SQL update syntax and Examples The routine database tutorial is an ever-changing data storage. SQL is used to modify The data that has been updated in The database and delete commands. The update statement can update one or more record commands in The table. UPDATE table_name SET column_name = expression WHERE conditions Instance 1 UPDATE AntiqueOwners SET

Call the Java program in Oracle, note: The Java method must be of type static if you want to use System.out/err output log in Java.Need to execute "call Dbms_java.set_output (5000);" In Oracle.First, Helloword1 Write Java program, also write in Sql/plus, and execute.Create or replace and compile Java source named Hello aspublic class Hello {static public string Message (string name) {Return "Hello," + name;}}/2 Publishing Java ProgramsCreate or Replac

Label:Begin transaction--Start TransactionDECLARE @errorSun INT--Define error countersSET @errorSun = 0--yes, 0.UPDATE dbo. Test SET testname= ' 232 'WHERE testid=1--transaction operation SQL statementSET @[email Protected][email protected] @ERROR--whether the accumulation is wrong--waitfor delay ' 0:2:0 '--Delay 2 minutesUPDATE dbo. Testcustorm SET testnickname1= ' Nick232 'WHERE testid=1--transaction operation S