How to use if condition in Oracle SQL query?

How to use if condition in Oracle SQL query?

Syntax. IF (a <= 20) THEN c:= c+1; END IF; If the Boolean expression condition evaluates to true, then the block of code inside the if statement will be executed. If the Boolean expression evaluates to false, then the first set of code after the end of the if statement (after the closing end if) will be executed.

Can we use if else in Oracle SQL?

Syntax for IF-THEN-ELSE Statements:

In the above syntax, keyword 'IF' will be followed by a condition which evaluates to 'TRUE'/'FALSE'. The control will execute the <action_block1> only if the condition returns <TRUE>. In case of condition evaluates to <FALSE> then, SQL will execute <action_block2>.

How to use SELECT statement in Oracle?

The Oracle SELECT clause:

After the Oracle SELECT keyword, specify the names of the columns that you would like to retrieve, separated by comma (,). You can specify as many columns as you want; you can even specify the same column more than once. The columns appear in the order selected.

How to check multiple conditions in if statement in Oracle?

If you have multiple blocks of codes to be executed based on different conditions, you can use the "IF … ELSIF" statement. Here is a sample script on IF statements: DECLARE day VARCHAR2; BEGIN day := 'SUNDAY'; IF day = 'THURSDAY' THEN DBMS_OUTPUT.

Can I put an if statement in a SQL query?

IF statements can be used to conditionally enter into some logic based on the status of a condition being satisfied. The IF statement is logically equivalent to a CASE statements with a searched-case-statement-when clause.

How to use the IF function in SQL?

MySQL IF-THEN-ELSE statement

The syntax looks as follows: IF condition THEN statements; ELSE else-statements; END IF; If a specified condition is: true – statements between IF-THEN and ELSE will be executed.

How do you write an IF ELSE condition in SQL?

The following are the syntax that illustrates the use of the IF ELSE statement in SQL Server:

  1. IF expression.
  2. BEGIN.
  3. Statement block — It executes when the IF clause expression is TRUE.
  4. END.
  5. ELSE.
  6. BEGIN.
  7. Statement block — It executes when the IF clause expression is FALSE.
  8. END.

How to SELECT a specific row in Oracle?

Firstly number the rows by row_number() function and then order by them : select * from ( select row_number() over (order by 0) rn, t.

How do you query a SELECT statement?

The SQL SELECT Statement

  1. SELECT column1, column2, … FROM table_name;
  2. SELECT * FROM table_name;
  3. ExampleGet your own SQL Server. SELECT CustomerName, City FROM Customers; Try it Yourself »
  4. Example. SELECT * FROM Customers; Try it Yourself »

How do I query multiple conditions in SQL?

You can combine N number of conditions using the AND operator. For an action to be taken by the SQL statement, whether it be a transaction or a query, all conditions separated by the AND must be TRUE.

Can we use multiple if condition in SQL?

SQL IF statements allow you to perform a number of functions at the same time. If you would like, you can implement two entirely different execution paths inside the same file and execute them subject to defined conditions being satisfied.

How do you add an IF condition in SQL?

IF condition in SQL

IF() function is passed with two parameters, one for true and other for false. The function returns one value if a condition is TRUE, and another value if the condition is FALSE.

How do you set an IF function?

Insert an IF Function

  1. Click where you want to add the function.
  2. Click the Formula tab.
  3. Click the Logical button.
  4. Select IF. The Function Arguments dialog box opens.
  5. Enter the IF function arguments:
  6. Click OK when you're finished.

How to write 2 conditions for order by in SQL?

After the ORDER BY keyword, add the name of the column by which you'd like to sort records first (in our example, salary). Then, after a comma, add the second column (in our example, last_name ). You can modify the sorting order (ascending or descending) separately for each column.

How to SELECT first 10 rows in Oracle?

select * from ( select * from the_table order by object_id ) where rownum <= 10; It's not pretty, but it is effective. In fact, it is very effective if the column (or columns) in the ORDER BY have a b-tree index. Oracle reads the index entries in order so that it can avoid having to sort the entire result set.

How to SELECT top 5 rows in Oracle?

SQL SELECT TOP Clause

  1. SQL Server / MS Access Syntax. SELECT TOP number|percent column_name(s) FROM table_name;
  2. MySQL Syntax. SELECT column_name(s) FROM table_name. LIMIT number;
  3. Example. SELECT * FROM Persons. LIMIT 5;
  4. Oracle Syntax. SELECT column_name(s) FROM table_name. WHERE ROWNUM <= number;
  5. Example. SELECT * FROM Persons.

What are the 3 types of SELECT query?

SELECT statement options

  • FROM is used to specify a table name where a necessary column with data is located. …
  • AS is used to create a temporary name for the column headings. …
  • GROUP BY is used to group results with similar data. …
  • HAVING is used to define a search condition.

How do I SELECT specific data in SQL?

The SQL SELECT Statement

  1. SELECT column1, column2, … FROM table_name;
  2. SELECT * FROM table_name;
  3. ExampleGet your own SQL Server. SELECT CustomerName, City FROM Customers; Try it Yourself »
  4. Example. SELECT * FROM Customers; Try it Yourself »