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1, right-click on the root directory under the connection to create the databaseEnter the database name, set it up, and click on the page to determine the success of the creation2. Double-click to open DatabaseThe first of these is the table, the most important and fundamental of the table.3, CREATE
Create PROCEDURE pro_test (@userName NVARCHAR ( -) ) as--Select* from[dbo]. [Table_2]--SELECT *From [dbo]. [Student] Beginbegin TRAN DECLARE @tempTable TABLE (tempid uniqueidentifier) DECLARE @tempId uniqueidentifier INSERT into tabl E_2 (UserName) OUTPUT Inserted.userid into @tempTable VALUES (@userName)--insert data into the first table SELECT @tempId=tempid fr
keyThe format is: ALTER TABLE table nameAdd constraint pk_ field name--"PK" is the abbreviation for the primary key, the field name is the name of the field on which to create the main key, ' pk__ field name ' is the con
Tags: on as SQL type Oracle table text class ROMQuery all columns and their properties for a table:Select From User_tab_columns t,user_col_comments Cwhere t.table_name = c.table_name and T.column_name = c.column_name and t.table_name = women;To find the primary key for a table:Find the foreign
Create a role tableCREATE TABLE Nbctxp. Tbl_nbc_nonbankrole (ID BIGINT not NULL,ROLENAME VARCHAR (50),Createtime TIMESTAMP,UpdateTime TIMESTAMP,CONSTRAINT p_id PRIMARY KEY (ID));CREATE INDEX SQL150130091455900 on NBCTXP. Tbl_nbc_nonbankrole (ID);Let the
Li Wu:Heng Learn to think together, honouring teachers save Thanksgiving. Leaf See root three return to one, rivers the same oneness.Meekness Conscience Lord, willing to do without regrets to the most bitter. Reading exercises to keep the body and mind, sincere advice and the line and cherish. Data, data, Lingen on the data. You must be cautious about operating the database. Give the most bitter code here, and take a look at it, to have your own judgment. Meet the choice, or ashamed t
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
. Because the field is to be the primary key for a table, the first condition is to ensure uniqueness in the table. At the same time, combining the characteristics of the SQL Server database itself, you can
. major_id and F. minor_id = 0 where D. Name = 'query table name' II,-- Query stored proceduresSelect case. xtype when 'p' then' Stored Procedure 'end as lx,. name, B. text from sysobjects a left Outer Join syscomments B on. id = B. ID where xtype = 'P'-- Query viewSelect case. xtype when 'v'then' view 'end as lx,. name, B. text from sysobjects a left Outer Join syscomments B on. id = B. ID where xtype = 'V' -- P
In my BSOOC, I need an SQL statement to query the foreign key information of the table's primary key. Last night I studied it at AM and finally achieved this goal:Oracle:Select o. obj # as objectId, o. name AS tableName, oc. name AS constraintName,Decode (c. type #, 1, &
SQL statement used to query the foreign key information of a table's primary key. In my BSOOC, I need an SQL statement to query the foreign key information of the table's primary
in two tables to control the data that can be stored in the foreign key table. In a foreign key reference, a link is created between two tables when one or more of the columns containing the primary key values of one table are re
')SET Identity_insert [Classes] OFF -----Add a column, delete the self-increment column, modify the column name ALTER TABLE classes add id_temp intUpdate a set Id_temp=id ALTER TABLE classes drop column IDexec sp_rename ' id_temp ', ' ID ', ' column ' --------by modifying the system's Column properties on the table, improper use of the method will likely cause o
must be enclosed in the database .Stu_namenvarchar( $)Unique--qunique Constraints)Insert intoStudent2Values(1,6000,'male','Zhang San');--OKInsert intoStudent2Values(2,6000,'male','Zhang San');--error violates the unique constraintInsert intoStudent2Values(3,6000,'male','John Doe');--OKInsert intoStudent2Values(NULL,6000,'male','Harry');--The error primary key cannot be null, the error message is "Canno
Reprint for self-study ERROR 1075 (42000): incorrect table definition; There can is only one auto column and it must be defined as a key Mysql> CREATE TABLE ANIMALS1 ( -> grp ENUM (' Fish ', ' mammal ', ' bird ') not NULL, -> ID mediumint not NULL auto_increment, -> name CHAR (not NULL), ->
and keyvalue. Just like a Hashtable, give a keyname, you can know what the current keyvalue is, and then manually implement key value data increment. In SQL Server, you can write a stored procedure to automate the process of taking a key value. The code is as follows: Copy Code code as follows:
Posted from http://www.sqlservergeeks.com/primary-key-and-unique-key-difference-in-sql-server/Primary and Unique Key both enforce uniqueness of columns on which they is defined. Then wh
1. Create a table Create TableTest_increase (useridNumber(10)Not Null Primary Key,/*Primary Key, automatically added*/UsernameVarchar2(20)); 2,
DECLAREICount number (2): = 0;BEGINSelect count (*) INTO iCount FROM user_sequences u WHERE u. sequence_name = 'seq _ TCAPITALNOTIFY ';IF iCount = 0THEN/* Create sequence */Execute immediate 'create sequence SEQ_TCAPITALNOTIFY minvalue 1 nomaxvalue start with 1 increment by 1 ';End if;Select count (*) INTO iCount FROM user_tables u WHERE u. TABLE_NAME = 'tcapital=y ';IF iCount = 0THEN/*
Label:When we use SQL server databases , we often create primary keys and indexes , so what is the difference between a primary key and an index? In this paper, we mainly introduce the difference between
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