WHERE clause is used to specify conditions while retriving data from table using various SQL queries. In this tutorial we will learn how to use the WHERE clause in SQL queries.
第六类、SQL语句(Statement) SQL的语句,可以说是SQL语法的主体,用来对某一个特定的数据库发出指示,并返回相关的数据,而SQL的语法结构,基本上可以利用下面 的式子来表示:命令+条件子句 例如: SELECT*FROM TAB WHERE TAB.NAME='A' 其中的“FROM...WHERE”便是一个条件子句,其实SQL的语法并不难,您只需记住这样...
第六类、SQL语句(Statement) SQL的语句,可以说是SQL语法的主体,用来对某一个特定的数据库发出指示,并返回相关的数据,而SQL的语法结构,基本上可以利用下面 的式子来表示:命令+条件子句 例如: SELECT*FROM TAB WHERE TAB.NAME='A' 其中的“FROM...WHERE”便是一个条件子句,其实SQL的语法并不难,您只需记住这样...
WHERE Clause with UPDATE Statement The UPDATE statement is used to modify the existing records in a table. Using the SQL WHERE clause with the UPDATE statement, we can update particular records. If the WHERE clause is not used, the UPDATE statement would affect all the records of a table. ...
The following operators can be used in the WHERE clause:OperatorDescriptionExample = Equal Try it > Greater than Try it < Less than Try it >= Greater than or equal Try it <= Less than or equal Try it <> Not equal. Note: In some versions of SQL this operator may be written as !=...
WHERE clause syntax You use query criteria in the WHERE clause of a SELECT statement. A WHERE clause has the following basic syntax: WHERE field = criterion For example, suppose that you want the telephone number of a customer, but you only remember that the customer's last name is Bagel....
Acaseexpression produces a scalar value, while you want to evaluate conditions. You can use ...
The IN operator in SQL filters the result set based on a list of discrete values. It is always used with the WHERE clause.
Filtering a SQL DELETE Statement A WHERE clause can be added to a DELETE statement to only delete the rows that match a specific condition. For example, suppose we need to delete only the rows belonging to the employees (“EM”) from the Person table. In that case, we should use the ...
After you add a table and create a SET clause in an UPDATE statement in the SQL Query Builder, you can create a WHERE clause. The WHERE clause specifies which rows in the database table to update. Before you begin When you create a WHERE clause, you are specifying conditions that ...