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java - SELECT 1 from DUAL: MySQL - Stack Overflow
Jan 16, 2011 · The "dual" table/object name is an Oracle construct, which MySQL supports for compatibility - or to provide a target for queries that dont have a target but people want one to feel all warm and fuzzy. E.g. select curdate() can be. select curdate() from dual Someone could be sniffing you to see if you're running Oracle.
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SELECT 1 from DUAL: MySQL - ExceptionsHub
Dec 19, 2017 · The “dual” table/object name is an Oracle construct, which MySQL supports for compatibility – or to provide a target for queries that dont have a target but people want one to feel all warm and fuzzy. E.g. select curdate () can be. select curdate () from dual.
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SQL DUAL Table - w3resource
Feb 26, 2020 · The following command select two rows from dual : SELECT dummy FROM DUAL UNION ALL SELECT dummy FROM DUAL; Output. 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 ----- …
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What is the use of dual in MySQL? - Quora
In MySQL (and also in most other RDBMS) you just leave off the FROM clause from your SELECT statement. If you’re coming from Oracle and now using MySQL, DUAL is for making you feel at home with MySQL. Because in Oracle, a SELECT should follow a FROM clause.
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SQL SERVER - SELECT * FROM dual - Dual Equivalent - SQL ...
Jul 20, 2010 · 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. It will return only one record with the value ‘X’.
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sql - SELECT from nothing? - Stack Overflow
Sep 17, 2010 · SELECT 1 FROM DUAL; SELECT 1 + 1 FROM DUAL; SELECT SQRT(2) FROM DUAL; These are the RDBMS and their respective dummy tables: DB2: SYSIBM.DUAL; Derby: SYSIBM.SYSDUMMY1; H2: Optionally supports DUAL; HSQLDB: INFORMATION_SCHEMA.SYSTEM_USERS; MySQL: Optionally supports DUAL; Oracle: DUAL; Sybase SQL Anywhere: SYS.DUMMY
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When to use dual in MySQL SELECT statement?
SELECT can also be used to retrieve rows computed without reference to any table. For example: You are permitted to specify DUAL as a dummy table name in situations where no tables are referenced: DUAL is purely for the convenience of people who require that all SELECT statements should have FROM and possibly other clauses.
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Is it possible to have multiple rows with select from dual?
Well if (1, 2, 4542, 342) were a string you could do this: No. dual has just one row, but you can use union all: This is just one way to generate a table "on-the-fly" in Oracle. Dual table is basically a dummy table which is having one row and one column and is exists in sys schema
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What does select 1 from dual mean in Java?
The validationQuery was set to "select 1 from DUAL" (obviously) and apparently the connection pool defaults testOnBorrow and testOnReturn to true when a validation query is non-null.
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