Example using interval, SQL> SELECT TO_CHAR(INTERVAL '600' SECOND, 'HH24:MM') FROM dual; TO_CHAR(INTERVAL'60 ----- +00 00:10:00.000000

Dual table is a dummy one used for calcualtion.if u display anything on columns it vl shows the result. in ur case 1 is column name mysql> SELECT 1 FROM DUAL WHERE 2

· 테이블의 행의 수가 N개이면 1이 N행 반환됩니다. · .. 摘要： 1 select 1 from dual 在这条sql语句中的1代表什么意思？ 查出来是个什么结果？ 其实： 1 2 3 select 1 from table; select anycol(目的表集合中的任意一行） from table; -- (目的表集合中的任意一行） select * from table 上面这三条语句从作用上来说是没有差别的，都是查看是 You can select from dual or from your own tables too, you can if you want. For me, I'll stick with dual because I know dual exists. I know it has at least 1 and at most 1 row. I know the optimizer knows all about dual and does the most efficient thing for me.

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It stopped on the DUAL is a table with has exactly one row as the following SQL statement will show:. SELECT * FROM dual; Your dual2 table has no rows. If you insert one, you will see the same behavior. 4*5 is an expression that Oracle can evaluate without actually using data from the table.

The SQL statement SELECT ROUND(45.926, -1) FROM DUAL; a) is illegal b) prints garbage c) prints 045.926 d) prints 50.

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Conclusion. There aren’t actually many nice solutions to do such a simple thing in SQL. DUAL is a table with has exactly one row as the following SQL statement will show:. SELECT * FROM dual; Your dual2 table has no rows. If you insert one, you will see the same behavior.

· .. 摘要： 1 select 1 from dual 在这条sql语句中的1代表什么意思？ 查出来是个什么结果？ 其实： 1 2 3 select 1 from table; select anycol(目的表集合中的任意一行） from table; -- (目的表集合中的任意一行） select * from table 上面这三条语句从作用上来说是没有差别的，都是查看是 You can select from dual or from your own tables too, you can if you want. For me, I'll stick with dual because I know dual exists. I know it has at least 1 and at most 1 row.
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SELECT 18 N FROM DUAL UNION ALL. SELECT 19 N FROM DUAL UNION ALL. SELECT 21 N FROM DUAL), lagged AS (SELECT n, LAG(n) OVER (ORDER BY n) lag_n FROM base), groups AS (SELECT n, row_number() OVER (ORDER BY n) groupnum. FROM lagged. WHERE lag_n IS NULL OR lag_n < n-1…

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När jag kör select t.id, t.f_rc(id) from my_table t. jag får. id F_RC (TID) 1 2 3 as ( SELECT 1 ID, 'A' in_node, 'B' out_node, 17 weight FROM dual UNION ALL 

You are permitted to specify DUAL as a dummy table name in situations where no tables are referenced: mysql> SELECT 1 + 1 FROM DUAL; -> 2.

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