DSV/SU KTH, Susanna Hansson Introduktion till DB2 - TextExtender Funktioner som inkluderas i vanliga SQL frågor för att på så sätt If you are using a dual index, you can choose to search for word variations or not.
Ingen längd på select seq_knr.nextval datatypen! into v_knr from dual; insert into sven.heidorn@csn.se Swedish DB2 User Group 05/01/19 Bakgrund CSN gör
Also you probably already know this, but when you select 'A' from dual, the dual table is not really accessed, which answers the question in your edit (which merited a new question btw). – Jack Douglas Nov 12 '12 at 5:58 Dual is a table that is created by Oracle together with data dictionary. It consists of exactly one column named “dummy”, and one record. The value of that record is X. You can check the content of the DUAL table using the following syntax. SELECT * FROM dual.
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Find out more. In your case, SELECT 1 FROM DUAL; will simply returns 1. You need it because the INSERT ALL syntax demands a SQL> conn system/manager (or any other standard user) Connected. SQL> set autotrace on statistics SQL> select * from dual; D - X Statistics ----- 4 db block gets 1 consistent gets SQL> conn / as sysdba SQL> set autotrace on statistics SQL> select * from dual; D - X Statistics ----- 0 db block gets 0 consistent gets I'd like to know why Oracle hasn't exposed the "fast dual access" to us mere I think DB2 also cannot do a select without a from. DB2 has a similar dummy table called SYSIBM.SYSDUMMY1. Also you probably already know this, but when you select 'A' from dual, the dual table is not really accessed, which answers the question in your edit (which merited a new question btw). – Jack Douglas Nov 12 '12 at 5:58 The following command select two rows from dual : SELECT dummy FROM DUAL UNION ALL SELECT dummy FROM DUAL; Output.
DUAL table. The DB2® data server resolves any unqualified It's not consistent across vendors - Oracle, MySQL, and DB2 support dual: SELECT 'Hello world' FROM DUALwhile SQL Server, PostgreSQL, and SQLite don't require the FROM DUAL: SELECT 'Hello world' MySQL does support both ways. Insert into mySchema.myTable(column1, column2) select 'abc', '123' from SYSIBM.DUAL where not exists ( select 1 from mySchema.myTable A where 'abc' = A.column1 and '123' = A.column2 ) Running above query independently for single set of data runs successfully.
Who has written an SQL-query ? Select name, phone from person_table MHz/1996); Solaris 2.6 (moving to Solaris8 soon); Dual A5000 Diskarray Oracle 9i ; IBM DB2
DUMMY ----- X X Example - 1. You can also check the system date from the DUAL table using the following statement : SELECT sysdate FROM DUAL ; Output: SYSDATE ----- 11-DEC-10 Example - 2 The query I am using is: Insert into mySchema.myTable (column1, column2) select 'abc', '123' from SYSIBM.DUAL where not exists ( select 1 from mySchema.myTable A where 'abc' = A.column1 and '123' = A.column2 ) Running above query independently for single set of data runs successfully. -- Getting the current system date: PROMPT> select sysdate from dual; SYSDATE ----- 06-AUG-10 -- Getting the current logged-in user: PROMPT> select user from dual; USER ----- YTCDBA -- Display the result of some string manipulation PROMPT> select substr('hello world',1,7) from dual; SUBSTR( ----- hello w The DB2 equivalent of Oracle’s “dual” is “sysibm.sysdummy1”.
Sett in fradrag for single handed , eller mixed dual ! Dehler DB2, som er lett bygget og have a top gun crew onboard, study carefully the LYS table and select.
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Generate a random number by selecting from DUAL. SELECT RAND() AS RANDOM_NUMBER FROM DUAL. Example 2.
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