convert oracle sql to postgresql

1:oracle SQL Developer 4.0.2 download Link:Http://www.oracle.com/technetwork/developer-tools/sql-developer/downloads/index.html2: The downloaded file is sqldeveloper-4.0.2.15.21-1.noarch.rpm, RPM installation package cannot be installed directly on Ubuntu system, need to use alien to convert RPM to Deb for installation

; --() Select NVL (score,10) score from student;RowNum related--rownum is less than a certain number can be directly as a query condition (note that Oracle does not support select top) SELECT * from student where rownum --efficiency is much higher than the way onePaging Query(assuming 10 per page)Does not contain a sort:-Low Efficiency SELECT * FROM (select RowNum rn, d.* from Djdriver D ) p where p.rnSELECT * FROM (select RowNum rn, d.* from Djdrive

1. Monitor whether the index is usedIn addition to the primary key being an integrity constraint and automatically becoming indexed, the purpose of creating a normal index is to improve the query speed, and if we create indexes that are not used, then these unused indexes will play a role in blocking performance.Grammar: -- Check if an index is being used Alter Index index_name monitoring usage; -- Check all index usage Select * from v$object_usage; -- to delete an index that is not use

/** * * * object:userdefinedfunction [dbo]. [To_number] Script date:03/10/2015 17:13:09 * * * * **/SETAnsi_nulls onGOSETQuoted_identifier onGOCREATE FUNCTION [dbo].[To_number](@param1 varchar)returnsNumeric asbeginreturn Convert(Numeric,@param1) EndSecond, the reform of the platform's underlying code1. Introduction of SQL Server JAR package: Sqljdbc4-4.0.jar groupId >com.microsoft.sqlservergroupId>Art

Tags: using com ACL get maximum binding creat arch CharRecently in Oracle-related projects, just contact with Oracle, and SQL Server syntax is still different Sql server: Example: fx+ Current Month day +00001 As shown in the strength of the serial number Principle: First ' FX ' is fixed, getting the current month and

In the previous article I've talked about using synonyms to connect to Oracle under SQL Server 2005, and we can use synonyms to connect Oracle under SQL Server 2005 to real-time access to Oracle databases. However, if the table data stream in

oracle|server| Data | Database because the project needs to convert a database of previous Oracle to SQL Server, the database is migrated using SQL Server DTD today, but after import, only the table structure and data are imported. and table some of the primary key constrain

problem with SQL scripts causes the use of sqlplus to perform the Times error.The error message is "ORA-01756: the string in quotation marks does not end correctly", the online check is that the character encoding of the SQL script is not the same as the character encoding of Oracle.My Oracle is installed on a Windows system with GBK encoding, but the character

Oracle Link Http://www.eygle.com/case/sql_trace_2.htm Problem Description: Many times When we do database operations such as drop User,drop table and so on, often encounter such a mistake Ora-00604:error occurred at recursive SQL level 1. Such hints, many times, do not have the slightest use. This case provides a thought and method for reference in this kind of problem. 1. Problem occurred with dro

as shown below.The rest of the work is for us to do further processing of these data scripts.3, the data table data script substitution processingThe above describes a tool to get the correct data script, we use NAVICAT Premium or Toad for SQL Server can get a time script similar to the following format.N ' 2016-06-22 10:35:36.590 'In order to process the date data for Oracle, we need to

) + ') ' when @c_type = ' char ' then ' char (' +convert (varchar (2), @max_length) + ') ' When @c_type = ' text ' Then ' long '--here to map for further data types Else ' # # ' end) + (case if @is_nullable =1 then ' null ' else ' NOT null ' End ' + ', ' FETCH NEXT from Columns_cursor to @column_id, @c_name, @c_type, @max_length, @precision, @scale, @is_nullable END/********5. Output Build Table statement *********/Select Left (@cons_sql, Len (@cons_s

archived redo logs are transmitted or submitted to a remote server, then the primary database is obviously in archive mode, and those files are generated. Running in this mode allows for a small amount of data loss, because recovery can be performed at any point before a failure, regardless of the type of failure. This is similar in MSSQL, but there are three states to choose from. SQL Server Books Online, like many other online resources, tells the

Label:1,trunc--convertOracle:select trunc (sysdate) from dual output: 2016/5/24 SQL Server:select CONVERT (varchar (+), GETDATE (), 111) Output: 2016/05/242,to_char--datenameOracle:select To_char (sysdate, "Day") from dual; Output Tuesday SQL Server:select Datename (Weekday, GETDATE ()); output Tuesday3 Rownum--sql Ser

the two columns of root_id and prior IDs. Where level can be seen as depth root_id priorid ID NAME level ----------------------------------------------- --- 0 1 Namei 1 1 1 2 Lufei 2 1 1 3 Shanzhi 2 3 3 5 Suolong 3 0 4 qiaoba 1 4 4 6 luobin

oracle| function Time: 2005-02-18 Oracle's SQL functions are divided into single-line functions and multiline functions. One-line functions are valid only for a single record, and multi-line functions are valid for multiple records. Single-line functions include characters, numbers, dates, transformations, and normal functions. Examples of character functions: · All lowercase LOWER ('

Tags: oracle plsql performance Language SQLThese days to see the Oracle PL/SQL Real-combat this book, out of the study of the performance of the statement, the downstream standard on the impact of the code.1. Progressive processing The program declares a cursor c1, and then implicitly opens the cursor with a cursor for loop, the program queries the Customers tab

Recently found a good thing on the Internet sqlapi++, it is available to access multiple SQL databases (oracle,sql server,db2,sybase,informix,interbase,sqlbase,mysql,postgresql) C+ + Library. sqlapi++ directly invokes the APIs of the local Target database management system (DBMS) (unlike ADO using the OLE DB and/or ODB

---------------------------------------------------------- 0 SELECT STATEMENT Optimizer=choose 1 0 TABLE ACCESS (by INDEX ROWID) of ' EMP ' 2 1 INDEX (RANGE SCAN) of ' EMPNO ' (UNIQUE) Sql> SELECT * from emp where empno No rows selected Execution Plan ---------------------------------------------------------- 0 SELECT STATEMENT Optimizer=choose 1 0 TABLE ACCESS (by INDEX ROWID) of ' EMP ' 2 1 INDEX (RANGE SCAN) of ' EMPNO ' (UNIQUE) T

INDEXUnlocking user Locks Executed with the user password set in the first step of installing Oracle (e.g., Sqlplus "sys/zhb126 as SYSDBA") Alter user Scott account unlock; Then execute Sqlplus scott/tiger, which will ask you to modify Scott's new password.Setting command line support spaces Set Sqlblanklines onVariable substitution-variable substitution-this process only schedules an execution plan to improve execution efficiency

Part of the Data Control statement (DML)1.INSERT ( insert a recorded statement into the data table )INSERT into table name (field name 1, field Name 2, ...) Values (value 1, value 2, ...);INSERT into table name (field name 1, field Name 2, ...) SELECT (field name 1, field Name 2, ...) from another table name;field values for string types must be enclosed in single quotation marks, for example: ' Good day 'If the field value contains a single quotation mark ' required for string conversion, we re