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- How to install PLSQl program
- How to install the PLSQl program: first download the "plsql developer" package, unzip it and enter the program directory; then select the "plsql developer" installer and right-click with the mouse; then in the installation interface, select "Agree to the installation agreement"; finally select Just install the path.
- SQL 3450 2020-05-12 10:55:23
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- How to set primary key in database
- How to set the primary key of the database: first open the [SQL Server Management Studio] management tool and connect to the database; then right-click the [Table] menu and select [New] -> [Table]; finally hold down the [ctrl] key and right-click Select [Set Primary Key].
- SQL 27010 2020-05-12 10:45:18
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- What to do if the installation of sql server 2008 fails to restart the computer
- The solution to "Failed to restart the computer" when installing SQL Server 2008: First press the key combination "Win+R" on the keyboard to bring up the run window; then open the registry management interface; finally find and delete " PendingFileRenameOperations" item is enough.
- SQL 7562 2020-05-10 09:02:01
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- What is the usage of exists in oracle?
- Usage of exists in oracle: exists is followed by a subquery, the purpose is to check whether the result of the subquery is true. If the subquery is true, the outer sql statement is executed. exists does not return data, only true or false.
- SQL 8073 2020-05-09 13:17:15
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- What is the full Chinese name of sql?
- The full Chinese name of sql is Structured Query Language. It is a special-purpose programming language, a database query and programming language, used to access data and query, update and manage relational database systems.
- SQL 21017 2020-05-09 10:44:15
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- SQL database add, delete, modify, query syntax
- SQL database add, delete, modify and query syntax: 1. [SELECT * FROM table_name]; 2. [INSERT INTO table_name VALUES (value1, value2, value3,...)].
- SQL 8382 2020-05-06 13:34:58
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- What is wrong with the statements about sql statements?
- Regarding the SQL statement, the error is that "CREATE statement is used to create a table structure and append new records" because the function of the "CREATE" statement is to create a table structure and cannot append new records or append new records. The "INSERT" statement can be used.
- SQL 9529 2020-04-30 10:17:58
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- Usage of listagg function
- listagg is Oracle's column-to-row function. Its basic usage is "LISTAGG(XXX,XXX) WITHIN GROUP(ORDER BY XXX)", which means splicing together a field of each "Group" through the "Group by" statement.
- SQL 31952 2020-05-06 15:21:07
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- Oracle method to intercept the first digits of a string
- Oracle can intercept the first few digits of a string through the substr function. The syntax of the substr function is "substr(string,start,length)". Its parameter string represents the specified string to be intercepted. The parameter start specifies where in the string start.
- SQL 50284 2020-04-27 16:37:29
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- sqlserver2017 installation tutorial
- SQLserver2017 installation tutorial: First load the SQL2017 database image; then select "Installation -> New SQL Server Independent Installation"; then select "Developer Development Edition" and turn off the firewall; finally select the specific required functions and change the installation location.
- SQL 7615 2020-04-27 16:33:01
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- How to check sa password in sqlserver
- How to check the sa password in sqlserver: first log in to the system using windows identity; then right-click on the service name and select properties; then modify the password in the corresponding position; finally change to sa login and enter the new modified password.
- SQL 29777 2020-03-23 09:13:46
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- What type of data model does sql server belong to?
- SQL Server is a relational data model; SQL Server is a comprehensive database platform that uses integrated business intelligence tools to provide enterprise-level data management; SQL Server database engine provides a more secure and reliable solution for relational data and structured data. storage function.
- SQL 15773 2020-03-23 09:08:50
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- Which data manipulation statement in SQL does not include?
- Data operation statements in sql do not include the "CHANGE" statement. "CHANGE" is used to rename fields and cannot modify field types and constraints; data operation statements in sql include "INSERT", "DELETE", and "UPDATE".
- SQL 14277 2020-03-14 10:26:46
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- How to use exists in oracle
- The usage of exists in Oracle: 1. exists is followed by a subquery; 2. The function of exists is to check whether the result of the subquery is true. If it is true, the outer SQL statement is executed; 3. If the subquery is false, then Return false.
- SQL 14286 2020-03-06 17:56:03
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- What is the Oracle table creation statement?
- Oracle table creation statement is CREATE TABLE tablename(column_name datatype). Where tablename is the name of the table to be created, column_name is the field name, and datatype is the field type.
- SQL 16350 2020-03-02 15:44:20
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