oracle11g

问题 On a query like: select col_A from t1 UNION ALL select col_A from t2 were select col_A from t2 return zero rows, Oracle 11G is taking forever to run. If t2 returns at least 1 row, this query is at least 10 times faster. Any thoughts? 来源： https://stackoverflow.com/questions/45105606/union-all-takes-forever-with-null-dataset

问题 I followed the instructions outlined in this post to split a delimited string into rows of a table: Splitting string into multiple rows in Oracle The answer that worked for that particular delimited string is represented in this fiddle: Demo1 with temp as ( select 108 Name, 'test' Project, 'Err1, Err2, Err3' Error from dual union all select 109, 'test2', 'Err1' from dual ) select distinct t.name, t.project, trim(regexp_substr(t.error, '[^,]+', 1, levels.column_value)) as error from temp t,

问题 I need to use a INTERVAL EXPRESSION for a calculated field. like below: @Formula(" SYSDATE - INTERVAL '1' HOUR * SHOW_LIMIT_HOURS ") private Date showLimitDate; However, hibernate produces the following SQL fragment considering this expression like a column. and product0_.sold_at > ( SYSDATE - settings0_.INTERVAL '1' settings0_.HOUR * setting0_.SHOW_LIMIT_HOURS ) Anybody could help me ? 回答1: After 2 days suffering, analysing AST processing of hibernate source code i finally gave up !! =P ..

问题 I am having an issue trying to convert multiple dates to one defined format. We are receiving the multiple dates from another DB source so I do not have control of the formatting until it reaches ours. Here are all the formats: YYYYMMDD YYYY-MM-DD HH:MM:SS MM/DD/YYYY MM-DD-YYYY Abrieviated Day Month DD HH:MM:SS TimeZone YYYY ('Thu Feb 02 20:49:59 MSK 2012') Fully written Day, Month DD, YYYY HH:MM:SS AM/PM My requirement is to set them all to the standard MM/DD/YYYY format or null. Any ideas?

问题 I've written this simple example DML with WITH statement: WITH seq AS (SELECT to_char(LEVEL - 1) p FROM dual CONNECT BY LEVEL <= 10) SELECT old_value, new_value FROM (SELECT to_char(t1.p) old_value, to_char(t2.p) new_value FROM (SELECT row_number() over(ORDER BY p) rn, p FROM seq) t1, (SELECT row_number() over(ORDER BY dbms_random.random) rn, p FROM seq) t2 WHERE t1.rn = t2.rn); Is there any way to use WITH statement in INSERT statement? FIDDLE 回答1: as mentioned here : https://forums.oracle

问题 Is there a way to tell if an element is at least 3 times in a column without using Count and Group By? EDIT: The answer is expected in SQL (mysql or oracle11g) in which only SELECT, FROM, WHERE and JOINS are used . And of course, all the logical operators and quantifiers as RELATIONAL CALCULUS WITH TUPLES has NO tools at all. Example of tuples: { t : {name} | ∃ s : {name, wage} ( Employee(s) ∧ s.wage = 50.000 ∧ t.name = s.name ) } here, the limitations of Relational Calculus with tuples are

问题 I have a value like "RWCE RU Regional" in an attribute and I need only first four characters I.e the output should be "RWCE" 回答1: Use subtring function. SUBSTR('RWCE RU Regional',1,4) should do. 来源： https://stackoverflow.com/questions/27873934/how-to-trim-characters-from-a-string-in-oracle

问题 Brand new to dealing with Oracle Reports and Forms so forgive any terminology/syntax issues. Given new assignment to help another developer put new systems into place. New Systems are essentially COPIES of existing systems. The process that I've seen involves a LOT of by hand updates of FORM properties (Names and Report Group Sources) and Same is true for REPORTS. FRM and RDF files. This is all done "by hand", open/change/save/next. (Don't ask, it's one of those "we've always done this" and

问题 I have searched Stackoverflow about pivot in Oracle 11g but could not find the syntax that works for my situation. Below is my query (runs in Oracle 11g). select age, gender, sum(hours) as hours from table1 group by age, gender Here is the O/P result age gender hours 25 Male 10 55 Female 5 45 Female 12 ...And here is my desired O/P result Age Male Female 25 10 0 45 0 12 55 0 5 ...And here is my query select * from ( select age, gender, sum(hours) as hours from table1 ) pivot ( sum (hours) for

问题 Agent Connection to Instance Status Failed Details ORA-12505: TNS:listener does not currently know of SID given in connect descriptor (DBD ERROR: OCIServerAttach) Listener file listener.ora Network Configuration File: E:\app\Administrator\product\11.2.0\dbhome_1\network\admin\listener.ora Generated by Oracle configuration tools. LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = 169.254.52.209)(PORT = 1521)) ) ) ADR