decode statement in sql

Cakephp is used to print SQL statements. Cakephp: how to print SQL statements. This document describes how to print SQL statements by cakephp. Share it with you for your reference. The specific implementation method is as follows: the following statement cakephp is used to print the

GROUP BY statement to filter the recordset returned by the group by statement. The existence of a having statement compensates for deficiencies in the where keyword cannot be used in conjunction with aggregate functions. Grammar: SELECT column1, Column2, ... column_n, aggregate_function (expression)From tablesWHERE predicatesGROUP by Column1, Column2, ... colu

In one sentence, convert a Linq statement to an SQL statement.Zookeeper Public IEnumerable {IEnumerable IQueryable MerchantList = Report_List (); # Region obtain the VMB_Report set from MerchantList ResultModel = merchantList. Select (o => new VMB_Report{ MerchantID = o. MerchantID,MID = o. MID,DBA = o. DBA,DBAPhone = o. DBAPhone,ContactName = o. ContactName,TotalSalesYTD = o. MerchantVolume. TotalSalesYTD,

password: Grant select,insert,update,delete on mydb.* to [emailprotected] identified by ""; BACKUP Database Common command: mysqldump–h host–u username–p dbname> save path and file name and then enter, will let you input user password, enter the password, then enter the OK; mysqldump– Hlocalhost–uroot–p Test >e:\db\test.sql This command specifically explains: The command is to back up the test database andContent is stored as a Test.sql file, and is saved under E:\db; The command is preceded

SET PARSEONLYCheck the syntax of each Transact-SQL statement and return any error message without compiling or executing the statement.Set parseonly {ON | OFF}When set parseonly is ON, SQL Server only analyzes statements. When set parseonly is OFF, SQL Server compiles and runs the statement.Set parseonly is SET during

The performance of the system is not ideal, except in part because the application load does exceed the actual processing capacity of the server, more because the system has a large number of SQL statements need to be optimized. In order to achieve stable execution performance, the simpler the SQL statement, the better. For complex

$ session where sid = '20140901 ';Query the corresponding SQL statement based on the sidSelect SID, SQL _TEXT from v $ open_cursor where SID = '000000 '; 20. View wait StatusSELECT v $ waitstat. class, v $ waitstat. count, SUM (v $ sysstat. value) sum_valueFROM v $ waitstat, v $ sysstat WHERE v $ sysstat. name IN ('db block gets ','Consistent gets') group by v

improvement from the application optimization. Many optimization experts believe that the optimization of the application can achieve a 80% improvement in system performance.Optimization of the applicationThe optimization of an application can usually be divided into two areas: source code and SQL statement. Because of the change of program logic, the optimization of source code is expensive in time cost a

Statement Object Execution SQL statementabout statement. It is an important step in Java performing Database operations, and can execute a few simple SQL statements to complete the operation of the database. It has two sub-interfaces, namely PreparedStatement and CallableStatement. The

Evaluate the SQL statement and insert it to the third table based on the same fields of the two tables. I now have two tables A and B nbsp; now there is A field in Table A: zhanghao, there is also A field in field B: zhanghao. I want to insert the data in Table A and Table B into the third table based on the same fields in Table A and Table B, how to write SQL s

Times, lob pre-read 0 Times.Table ' Ufi8s6u81179717475734 ' . Scan count 1 , Logical read 37 Physical reads 0 Times, pre-read 0 Times, lob logic reads 0 Physical lob reads 0 Times, lob pre-read 0 Times.Table ' Ufi2j0n11179717502375 ' . Scan count 1 , Logical read 46 Physical reads 0 Times, pre-read 0 Times, lob logic reads 0 Physical lob reads 0 Times, lob pre-read 0 Times. Table found hereUft3a6h61176948132312 has near

SQL and MySQL statement execution sequence analysis, sqlmysql statement Sequence Today, I encountered a problem: Can I use the as alias in the insert into, update, and delete statements of mysql? I am still looking at it, but I found some useful knowledge when I checked the materials. I would like to share with you about the