Select Query

A PL/SQL query is a statement used to retrieve data from a database. A PL/SQL subquery is a query that is nested inside another PL/SQL query.

The Oracle PL/SQL Query syntax typically consists of a SELECT clause, followed by a FROM clause, and optionally a WHERE, GROUP BY, and ORDER BY clause. For example:

SELECT * 
FROM table_name 
WHERE condition 
GROUP BY column_name 
HAVING condition 
ORDER BY column_name

Below are a list of pl/sql queries that you can use to learn some basic rules about queries.

ANY

The ANY keyword can be used in a query to return all rows from a table that meet a certain condition. For example:

SELECT * 
FROM table_name 
WHERE column_name = ANY (value1, value2, value3)

BETWEEN

The BETWEEN keyword can be used in a query to specify a range of values. For example:

SELECT * 
FROM table_name 
WHERE column_name BETWEEN value1 AND value2

EXISTS

The EXISTS keyword can be used in a query to check if a row exists in a table. For example:

SELECT * 
FROM table_name 
WHERE EXISTS (SELECT column_name FROM another_table WHERE condition)

GROUP BY

The GROUP BY keyword can be used in a query to group rows together. For example:

SELECT * 
FROM table_name 
GROUP BY column_name

HAVING

The HAVING keyword can be used in a query to specify a condition for the groups. For example:

SELECT * 
FROM table_name 
HAVING column_name = value

IN

The IN keyword can be used in a query to check if a value is in a list of values. For example:

SELECT * 
FROM table_name 
WHERE column_name IN (value1, value2, value3)

LIKE

The LIKE keyword can be used in a PL/SQL query to search for a specific pattern. For example:

SELECT * 
FROM table_name 
WHERE column_name LIKE '%value%'

ORDER BY

The ORDER BY keyword can be used in a query to sort the results. For example:

SELECT * 
FROM table_name 
ORDER BY column_name ASC/DESC

WHERE

The WHERE keyword can be used in a PL/SQL query to specify a condition. For example:

SELECT * 
FROM table_name 
WHERE column_name = value1 AND column_name2 = value2