oracle11g

问题 Is there a way to give a subquery in Oracle 11g an alias like: select * from (select client_ref_id, request from some_table where message_type = 1) abc, (select client_ref_id, response from some_table where message_type = 2) defg where abc.client_ref_id = def.client_ref_id; Otherwise is there a way to join the two subqueries based on the client_ref_id. I realize there is a self join, but on the database I am running on a self join can take up to 5 min to complete (there is some extra logic in

问题 Is there a way to give a subquery in Oracle 11g an alias like: select * from (select client_ref_id, request from some_table where message_type = 1) abc, (select client_ref_id, response from some_table where message_type = 2) defg where abc.client_ref_id = def.client_ref_id; Otherwise is there a way to join the two subqueries based on the client_ref_id. I realize there is a self join, but on the database I am running on a self join can take up to 5 min to complete (there is some extra logic in

问题 I've seen documentation for a TIMESTAMPDIFF function in Oracle here, but it mentions it's for "Oracle9i Lite". When I try to use the example on Oracle 11g: SELECT TIMESTAMPDIFF(SQL_TSI_DAY, CURRENT_DATE, '1998-12-09') FROM DUAL; I get an invalid identifier error on TIMESTAMPDIFF. Is this feature not available in Oracle 11g? Or is it something my DBA needs to configure? 回答1: That function doesn't exist in Oracle RDMBS; it clearly did in Oracle Lite (which I've never encountered) and I believe

问题 I've seen documentation for a TIMESTAMPDIFF function in Oracle here, but it mentions it's for "Oracle9i Lite". When I try to use the example on Oracle 11g: SELECT TIMESTAMPDIFF(SQL_TSI_DAY, CURRENT_DATE, '1998-12-09') FROM DUAL; I get an invalid identifier error on TIMESTAMPDIFF. Is this feature not available in Oracle 11g? Or is it something my DBA needs to configure? 回答1: That function doesn't exist in Oracle RDMBS; it clearly did in Oracle Lite (which I've never encountered) and I believe

问题 I've seen documentation for a TIMESTAMPDIFF function in Oracle here, but it mentions it's for "Oracle9i Lite". When I try to use the example on Oracle 11g: SELECT TIMESTAMPDIFF(SQL_TSI_DAY, CURRENT_DATE, '1998-12-09') FROM DUAL; I get an invalid identifier error on TIMESTAMPDIFF. Is this feature not available in Oracle 11g? Or is it something my DBA needs to configure? 回答1: That function doesn't exist in Oracle RDMBS; it clearly did in Oracle Lite (which I've never encountered) and I believe

问题 Goal: Swap the primary keys of two records without encountering an ORA-00001: unique constraint violated. The solution that 'works' (further below) is just a silly hack. Is there a feature/technique to defer constraint enforcement until the transaction is committed? As far as motivation - a legacy application that uses this data has a design flaw and relies on the IDs order and values - the request is to swap the PK values as follows: BEFORE: 388 English 389 French AFTER: 389 English 388

问题 I need to export a oracle table to a csv/excel file format (along with the column headings). A solution through cx_oracle or through sqlplus welcome. Python code from the comment: con = cx.connect() cur = con.cursor() printer = cur.execute(sqlcode) con.commit() 回答1: perhaps use csv module (from standard library): import csv cursor = connection.cursor() # assuming you know how to connect to your oracle db cursor.execute('select * from table_you_want_to_turn_to_csv') with open('output_file.csv'

问题 I need to export a oracle table to a csv/excel file format (along with the column headings). A solution through cx_oracle or through sqlplus welcome. Python code from the comment: con = cx.connect() cur = con.cursor() printer = cur.execute(sqlcode) con.commit() 回答1: perhaps use csv module (from standard library): import csv cursor = connection.cursor() # assuming you know how to connect to your oracle db cursor.execute('select * from table_you_want_to_turn_to_csv') with open('output_file.csv'

问题 I have designed a C# application to connect to Oracle Database and change schema users passwords. My reference assembly is System.Data.OracleClient from the location: "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.5\System.Data.OracleClient.dll" The platform that I used to design/test the application looks like this: 1. 64 bit Windows 7 platform. 2. 32 bit .Net Frameworkv4.5 3. 32 bit Oracle 10g Client. I need this application to run for 64 bit Oracle Client

问题 I have designed a C# application to connect to Oracle Database and change schema users passwords. My reference assembly is System.Data.OracleClient from the location: "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.5\System.Data.OracleClient.dll" The platform that I used to design/test the application looks like this: 1. 64 bit Windows 7 platform. 2. 32 bit .Net Frameworkv4.5 3. 32 bit Oracle 10g Client. I need this application to run for 64 bit Oracle Client