WHERE Clause in MySQL is a keyword used to specify the exact criteria of data or rows that will be affected by the specified SQL statement. The WHERE clause can be used with SQL statements like INSERT, UPDATE, SELECT, and DELETE to filter records and perform various operations on the data.
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Can we use in in WHERE clause?
The IN operator allows you to specify multiple values in a WHERE clause. The IN operator is a shorthand for multiple OR conditions.
What is the IN clause in SQL?
The SQL IN condition (sometimes called the IN operator) allows you to easily test if an expression matches any value in a list of values. It is used to help reduce the need for multiple OR conditions in a SELECT, INSERT, UPDATE, or DELETE statement.
Can we use 2 WHERE clause in SQL?
Example – Two Conditions in the WHERE Clause (OR Condition)
You can use the OR condition in the WHERE clause to test multiple conditions where the record is returned if any one of the conditions are met.
What is a WHERE and having clause?
HAVING Clause. 1. WHERE Clause is used to filter the records from the table based on the specified condition. HAVING Clause is used to filter record from the groups based on the specified condition.
What are clauses in SQL and name them?
SQL being a query language requires a method to apply constraints on the data and for this we use Clauses. We have a large variety in the SQL clauses like the Where clause, Union Clase, Order By clause etc. Clauses help us to restrict and manage the data using valid constraints on the data in our database.
What are the six clauses in SQL?
There are presently six clauses that you can utilize in an SQL statement. These six clauses in no particular order are SELECT, FROM, WHERE, GROUP BY, HAVING, and ORDER BY.
What are different clauses used in SQL?
SQL clauses
- CONSTRAINT clause. A CONSTRAINT clause is an optional part of a CREATE TABLE statement or an ALTER TABLE statement.
- EXTERNAL NAME clause.
- FOR UPDATE clause.
- FROM clause.
- GROUP BY clause.
- HAVING clause.
- WINDOW clause.
- ORDER BY clause.
What is the use of WHERE clause Mcq?
Explanation: “WHERE” clause is used to filter out unwanted rows and “SELECT” clause is used to select columns from table.
What does follow after the SQL WHERE clause?
The correct answer to the question “What does follow after the SQL WHERE clause” is option (B). Definition of the condition to be met for the rows to be returned.
How do I add an IF condition in SQL query?
You can use CASE to implement IF-THEN-ELSE in PL/SQL – this is just an example: select case field1 WHEN ‘1’ THEN ‘VALUE1’ WHEN ‘2’ THEN ‘VALUE2’ ELSE ‘VALUEOTHER’ END, case field2 WHEN ‘1’ THEN ‘VALUE1’ WHEN ‘2’ THEN ‘VALUE2’ ELSE ‘VALUEOTHER’ END from ( select ‘1’ “FIELD1”, ‘2’ “FIELD2” from dual );
What is the difference between having and WHERE clause in SQL?
A HAVING clause is like a WHERE clause, but applies only to groups as a whole (that is, to the rows in the result set representing groups), whereas the WHERE clause applies to individual rows. A query can contain both a WHERE clause and a HAVING clause.
Can we use WHERE clause with group by?
The GROUP BY Statement in SQL is used to arrange identical data into groups with the help of some functions.GROUP BY clause is used with the SELECT statement. In the query, GROUP BY clause is placed after the WHERE clause. In the query, GROUP BY clause is placed before ORDER BY clause if used any.
Why WHERE clauses Cannot be used with aggregate functions?
We cannot use the WHERE clause with aggregate functions because it works for filtering individual rows. In contrast, HAVING can works with aggregate functions because it is used to filter groups.
What is clause give an example?
A clause is a group of words that contains a verb (and usually other components too). A clause may form part of a sentence or it may be a complete sentence in itself. For example: He was eating a bacon sandwich. [clause]
What is the purpose of the SQL AS clause exam Veda?
The SQL WHERE clause:
limits the column data that are returned.
What of the following the having clause does?
The HAVING clause does which of the following? Acts like a WHERE clause but is used for groups rather than rows.Acts like a WHERE clause but is used for columns rather than groups.
Can I use case in where clause SQL Server?
CASE STATEMENT IN WHERE CLAUSE:
We can use a case statement in Where, Order by and Group by clause.So, by using a CASE statement with the where condition displays the result.
How many else clauses can an if statement have?
An IF statement can have any number of ELSIF clauses; the final ELSE clause is optional. Boolean expressions are evaluated one by one from top to bottom. If any expression returns TRUE , its associated sequence of statements is executed and control passes to the next statement.
Is there an IF function in SQL?
MySQL IF() Function
The IF() function returns a value if a condition is TRUE, or another value if a condition is FALSE.