sql profiler tutorial

original linkSelect the components you want, click here to choose All, install all componentsSelect the installation path, nextNextDefault instance, nextNextService account settings, choose to use the same account for all SQL Server servicesEnter the operating system's account name and password to determineNextAuthentication Mode: Mixed modeSet the password for the system administrator (SA)Click Add to specify the

tables.Next we look at the third line, which is the where clause. This is where we describe the conditions of the connection. Here, we want to confirm that the value of the Store_name field in the Geography table is equal to the value of the Store_name field in the store_information table. This WHERE clause is a connected soul character because its role is to determine the connection between the two tables is correct. If the WHERE clause is wrong, we are most likely to get a Cartesian connectio

integer PRIMARY KEY,Order_date datetime,Customer_sid integer REFERENCES CUSTOMER (SID),Amount double);The following example specifies a foreign key by changing the table schema.Here if the ORDERS table is already built. And the foreign key has not been specified:MySQL:ALTER TABLE ORDERSADD FOREIGN KEY (customer_sid) REFERENCES Customer (SID);Oracle:ALTER TABLE ORDERSADD (CONSTRAINT fk_orders1) FOREIGN KEY (customer_sid) REFERENCES Customer (SID);SQL

Oracle index creation and SQL optimization tutorial, oraclesql Database index: The index has a single column index compound index. If a field in a table has primary key constraints and uniqueness constraints, Oracle automatically recommends a unique index on the corresponding constraint column. The database index mainly improves the access speed. Construction Principles: 1. The index should be frequently c

SQL Tutorial: Nested select statements Nested select statements are also called subqueries, for example: Select name from BBC where region = (select region from BBC where name = 'Brazil ') The query result of one SELECT statement can be used as the input value of another statement. The preceding SQL statement is used to obtain all countries in the same re

So how do we set the conditions for the values that the function produces? For example, we may only need to know which stores have more than $1,500 turnover. In this case, we cannot use the where directive. What do we do then?Fortunately, SQL provides a having command, and we can use this command to achieve this goal. The HAVING clause is usually at the end of a SQL sentence. A

(' Los Angeles ', ' jan-10-1999 ');The second INSERT into allows us to enter more than one pen at a time. Unlike the example above, we are now going to use the SELECT command to specify the data to be entered into the table. If you want to say that this is not to say that the information is from another form, then you want to be right. The syntax for entering more than one pen at a time is:INSERT into "Table 1" ("Field 1", "Field 2", ...)Select "Field 3", "Field 4", ...From "Form 2";The above s

What does SQL do for you? One of the most commonly used methods is to select data from a table in the database. From this answer, we can immediately see two keywords: select from a table in the (from) database. (a table is a structure within a database that is designed to store data.) In this section of table handling , we'll mention how to use SQL to set tables. We can see the most basic

result set based on the specified column.The order BY statement sorts records by default in ascending order.If you want to sort records in descending order, you can use the DESC keyword. SELECT Company, OrderNumber from Orders ORDER by company SELECT Company, OrderNumber from Orders ORDER by company, OrderNumber SELECT Company, OrderNumber from Orders ORDER by company DESC SELECT Company, OrderNumber from Orders ORDER by company DESC, OrderNumber Desc INSERT into state

How to delete a data SQL statement in the mysql tutorial The delete from statement is used to DELETE records FROM database tables. Syntax Delete from table_name WHERE column_name = some_value Note: SQL is case insensitive. Delete from is equivalent to delete from. In order for PHP to execute the preceding statement, we must use mysql_query (function. This functio

We have provided three functions not to filter some special characters, mainly using PHP to filter out the SQL sensitive string, well, let's look at the code below. Have a friend in need to take a look. We have provided three functions not to filter some special characters, mainly using the PHP tutorial to filter out the SQL sensitive string, well, let's look at

In a 64-bit Win8 system, the Pl/SQL connection Oracle setup tutorial, win8oracle On Windows 8 64-bit system, 64-bit Oracle is installed, but there is no 64-bit PL/SQL, And the Oracle database cannot be connected. What should I do? There are some methods: we can install a 32-bit Oracle client to achieve the connection. First, download the 32-bit Oracle client:

we look at the third line, which is the where clause. This is where we describe the conditions of the connection. Here, we want to confirm that the value of the Store_name field in the Geography table is equal to the value of the Store_name field in the store_information table. This WHERE clause is a connected soul character, because its role is to determine the connection between the two tables is correct. Assuming that the WHERE clause is wrong, we are most likely to get a Cartesian connectio

Tags: SQL functionsSince many of the data in the database are digital, one important use is to be able to perform calculations on these numbers, such as aggregating them together or finding their average. SQL has a function that provides some of this type. They are: AVG Average COUNT Count MAX (maximum value) MIN (Minimum value) SUM Sum The syntax for applying a function is:Sel

Sometimes we decide that we need to clear a table from the database. In fact, if we can't do that, that would be a big problem, because the database Administrator-DBA is bound to be unable to manage the database efficiently.Fortunately, SQL has the syntax to provide a DROP table to let us clear the table. The syntax for DROP TABLE is:DROP table "table name";If we want to clear the customer form created in SQL