Question

Can you explain the means of “where, from, select”? Of SQL

Answer 1

Answer:

Structured Query Language (SQL) is the standard language for data manipulation in a DBMS.

WHERE : The SQL WHERE Clause is used to specify a condition while fetching the data from a single table or by joining with multiple tables. If the given condition is satisfied, then only it returns a specific value from the table you should use the WHERE clause to filter the records and fetching only the necessary records.

Syntax:
SELECT column1, column2, .....
FROM table_name
WHERE condition;

FROM : The SQL FROM clause is used to list the tables and any joins required for the SQL statement.

Syntax:
FROM table1
[ { INNER JOIN
| LEFT [OUTER] JOIN
| RIGHT [OUTER] JOIN
| FULL [OUTER] JOIN } table2
ON table1.column1 = table2.column1]

SELECT: The most commonly used SQL command is SELECT statement. SQL SELECT statement is used to query or retrieve data from a table in the database. A query may retrive information from specified columns or from all of the columns in the table. To create a simple SQL SELECT Statement, you must specify the columns name and the table name. The query is called SQL SELECT Statement.

Syntax:
SELECT column_list FROM table-name
[WHERE clause]
[GROUP BY clause]
[HAVING clause]
[ORDER BY clause]