mcsa sql 2016 database development

Make sure that the data type in the Code is consistent with the column type in the database It is important to ensure that the data types at each layer of your application are consistent. For example, if the data type of a column is NVARCHAR (50), you should use the same type of local variables in code query and stored procedures. Similarly, the ADO. NET code in the data layer should also specify the same data type and length. Why is this important? I

In web development, in addition to program SQL Injection Prevention, database security also prevents SQL injection in web development, what other aspects should I pay attention? ------ Solution ------------------ This is the most difficult question to answer. I want to break

Collation Some may have been using SQL Server for development for some time, but they have not or seldom used stored procedures in projects. Some may think that there is no need to use stored procedures. In fact, when a project is completed in the maintenance phase, you will find that the stored procedure has brought us benefits. It is easy to modify and cannot change our applications, you only need to modi

In web development, there are other aspects of database security in addition to preventing SQL injection on the program.

(primary key), Username VARCHAR2 (20), CONSTRAINT un_username Unique (username) ) 2. Adding a unique constraint when modifying a table CREATE TABLE USERINFO_U2 ( ID VARCHAR2 (primary key), Username VARCHAR2 (20) ) ALTER TABLE USERINFO_U2 ADD CONSTRAINT un_username_new Unique (username) 3. Delete a constraint disabling UNIQUE constraints ALTER TABLE USERINFO_U2 DISABLE CONSTRAINT un_username_new Delete ALTER TABLE USERINFO_U2 DROP CONSTRAINT un_username_new Five, check the constraints 1. Set CHE

One, add dataINSERT statement INSERT INTO TABLE_NAME (Name of field, field name) VALUES (value1,value2)1. Add values to all fields in the tableINSERT into UserInfoVALUES (1, ' xxx ', ' 123 ', ' [email protected] ', sysdate)2. Add values to the fields established in the tableINSERT into UserInfo (ID,USERNAME,USERPWD)VALUES (2, ' yyy ', ' 123 ')CREATE TABLE Userinfo1(ID number (6,0),RegDate Date Default Sysdate)INSERT into USERINFO1 (ID)VALUES (1)Second, copy the table data1. Copy all when creatin

Common Summary of MS-SQL Database Development 1. sort by strokes of the Last Name: Select * From tablename order by customername collate chinese_prc_stroke_ci_as 2. database encryption: Select encrypt ('original password ') Select pwdencrypt ('original password ') Select pwdcompare ('original password', 'encrypted pass

1. sort by surname strokes: Select * From tablename order by customername collate chinese_prc_stroke_ci_as 2. database encryption: Select encrypt ('original password') Select pwdencrypt ('original password') Select pwdcompare ('original password', 'encrypted password') = 1 -- same; otherwise, they are different. 3. retrieve the table fields: declare @ list varchar (1000), @ SQL nvarchar (1000) Select

1. Order BY last name stroke: Select * FROM TableName ORDER by CustomerName Collate Chinese_prc_stroke_ci_as 2. Database encryption: Select Encrypt (' original password ') Select Pwdencrypt (' original password ') Select Pwdcompare (' original password ', ' encrypted password ') = 1--same; otherwise different encrypt (' original password ') Select Pwdencrypt (' original password ') Select Pwdcompare (' original password ', ' encrypted password

1. Sort by last Name: SELECT * FROM TableName ordered by CustomerName Collate Chinese_prc_stroke_ci_as 2. Database encryption: Select Encrypt (' original password ') Select Pwdencrypt (' original password ') Select Pwdcompare (' original password ', ' encrypted password ') = 1--same; 3. Retrieve the field in the table: Declare @list varchar (1000), @sql nvarchar (1000) Select @list = @list + ', ' +b.name

1. sort by strokes of the Last Name:Select * From tablename order by customername collate chinese_prc_stroke_ci_as2. database encryption:Select encrypt ('original password ')Select pwdencrypt ('original password ')Select pwdcompare ('original password', 'encrypted password') = 1 -- same; otherwise, different encrypt ('original password ')Select pwdencrypt ('original password ')Select pwdcompare ('original password', 'encrypted password') = 1 -- same;

Data | database 1. Order BY last name stroke:Select * FROM TableName ORDER by CustomerName Collate Chinese_prc_stroke_ci_as 2. Database encryption:Select Encrypt (' original password ')Select Pwdencrypt (' original password ')Select Pwdcompare (' original password ', ' encrypted password ') = 1--same; otherwise different encrypt (' original password ')Select Pwdencrypt (' original password ')Select Pwdcompa

ProductName OrderDate 1 Computer 2008-12-26 2 Printer 2008-12-26 3 Electrograph 2008-11-12 4 Telephone 2008-10-19 Now, we want to select a record from the table above that OrderDate is "2008-12-26".We use the following SELECT statement:SELECT * from Orders WHERE orderdate= ' 2008-12-26 'Result set: OrderId ProductName OrderDate 1

1. Create a stored procedure Like a data table, we need to create a stored procedure before using it. Its concise syntax is: Create proc stored procedure name [Parameter list (multiple parameters are separated by commas (,)] As SQL statement For exampleCreate proc upgetusername @ Intuserid int, @ Ostrusername nvarchar (20) Output -- parameters to be output As Begin -- Assign the uname value to the @ ostrusername variable, that is, the parameter to be

sets are called sub-queries. There are two types of sub-queries: One is to return only a single-valued subquery, at which point it can be used where a single value can be used, when a subquery can be considered a function that has a return value; Another is a subquery that returns a column of values, at which point the subquery can be thought of as a data table that is temporarily present in memory. Create a new department table, an employee table, and a department column number for each

XML index. To learn more about XML types, look for articles on MSDN. There are also a variety of enhanced T-SQL index commands. Perhaps the most intriguing is the new "online" index type, which allows database administrators to perform index maintenance tasks without having to lock users out of the table. This is likely to mark the end of the situation where the datab