In such situations, we can use theCREATE DATABASE IF NOT EXISTSstatement to create a database only if there is no existing database with the same name. For example, CREATEDATABASEIFNOTEXISTSmy_db; Here, the SQL command creates a database namedmy_dbonly if there is no existing database...
-- update a single value in the given rowUPDATECustomersSETfirst_name ='Johnny'WHEREcustomer_id =1; Run Code Here, the SQL command changes the value of thefirst_namecolumn toJohnnyifcustomer_idis equal to1. Example: SQL UPDATE Statement Update Multiple Values in a Row We can also update ...
SQL or T-SQL Statement/syntax are quite important for the database developer, here are some selected basic statements with example using SQL Server that may help you to get started with sql query. Basic SELECT statement, * means all columns SELECT * FROM Customers Basic SELECT statement, speci...
In addition to using a SQL EXCEPT statement for filtering records from two tables, an EXCEPT statement can also be used to filter records from a single table. For example, the following EXCEPT statement will return all the records from the Books1 table where the price is less than or equal...
Taking the example of SQL create a statement with DEFAULT constraints, create a table with name bill which contains columns bill no as PRIMARY KEY, patient_if as foreign key, room_chargers and room_charges both column value must be greater than 0, and no_of_days having constrained as NOT...
Example 2: Use WITH on a CREATE TABLE statement We can also useWITHtogether with aCREATE TABLEstatement. Let's say we want to create a table using theWITHclause in the previous example, we would type in, CREATE TABLE Above_Average_Sales ...
SQL If Statement In this tutorial, you will learn how to write Conditional statements – IF and IF-ELSE. In real-world situations, we used to do something according to the result of something we expect. Say for example, “If tomorrow is a holiday, I’ll plan for a vacation”, “If ...
SQL examples: How to filter a SELECT statement In this section, we will take a glance at simple clause usage of the WHERE clause. If we want to filter the result set of the SQL SELECT statement, we have to use the WHERE clause. For example, we want to filter the fruits whose color...
Example: -- To update the status UPDATE Intellipaat SET status = 'Inactive' WHERE id IN (2, 4, 5); -- To check the updated records Select * from Intellipaat; Output: Explanation: The UPDATE statement updates the status of employees with IDs 2,4, and 5 to INACTIVE. Difference Between...
statement:需要执行的SQL语句。 hints:设置运行时参数,参数类型是DICT。 返回值说明 执行execute_sql()和run_sql()后的返回值是任务实例。详情请参见任务实例。 使用示例 示例1 执行SQL语句。 o.execute_sql('select * from table_name') #同步的方式执行,会阻塞直到SQL语句执行完成。 instance = o.run_sql...