How do you find odd rows in a table?
- To select all the even number records from a table: Select * from table where id % 2 = 0. To select all the odd number records from a table: Select * from table where id % 2 != 0.
- select * from emp where (rowid,0) in(select rowid,mod(rownum,2) from emp);—even.
- Even Number of Selection.
How do I retrieve alternate rows in SQL?
- In table of SQL we have columns and under each columns we insert records row by row. Please try this query once.
- In case of deletion of a row that has a BusinessEntityID an odd value, when this query is performed it will return two consecutive rows(contrary to the requirement) and vice versa for even value is also True.
How do you check if a number is even in Oracle?
Use the MOD function to determine whether a number is odd or even. For example, MOD (10, 2) = 0 and MOD (11,2)=1.
What is Rownum and Rowid in Oracle?
Rowid gives the address of rows or records. Rownum gives a count of records. Rowid is permanently stored in the database. Rownum is not stored in the database permanently. Rowid is automatically assigned with every inserted into a table.
How do I use Rownum in SQL?
You can use ROWNUM to limit the number of rows returned by a query, as in this example: SELECT * FROM employees WHERE ROWNUM < 10; If an ORDER BY clause follows ROWNUM in the same query, then the rows will be reordered by the ORDER BY clause. The results can vary depending on the way the rows are accessed.
How do I find unique records in SQL?
The unique values are fetched when we use the distinct keyword.
- SELECT DISTINCT returns only distinct (different) values.
- DISTINCT eliminates duplicate records from the table.
- DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc.
- DISTINCT operates on a single column.
How do I select all alternate keys in SQL?
The UNIQUE keyword is used to define the alternate key, which indicates the value must be unique. Simple words to say Candidate keys that are not selected as primary key are called Alternate key. UNIQUE (col1,col2…n);
How do you select only odd numbers in SQL?
“sql query to select odd numbers from a table” Code Answer
- SELECT t. First, t. Last.
- FROM (
- SELECT *, Row_Number() OVER(ORDER BY First, Last) AS RowNumber.
- –Row_Number() starts with 1.
- FROM Table1.
- ) t.
- WHERE t. RowNumber % 2 = 0 –Even.
- –WHERE t. RowNumber % 2 = 1 –Odd.
How do you check the number is even or odd in PL SQL?
PL/SQL Program to Check Number is Odd or Even
- n number:=&n
- if mod(n,2)=0.
- dbms_output.put_line(‘number is even’);
- dbms_output.put_line(‘number is odd’);
How do I find the row ID in Oracle?
Check block number and row id in Oracle
- Check the associated row id with block number in table. SELECT DBMS_ROWID.ROWID_BLOCK_NUMBER(rowid),rowid. FROM table_name;
- Find row id of particular Block Number. SELECT DBMS_ROWID.ROWID_BLOCK_NUMBER(rowid),rowid. FROM SCOTT.EMPLOYEES. where DBMS_ROWID.
- Example. –1. Create table.
How do I select specific rows in SQL?
To select rows using selection symbols for character or graphic data, use the LIKE keyword in a WHERE clause, and the underscore and percent sign as selection symbols. You can create multiple row conditions, and use the AND, OR, or IN keywords to connect the conditions.