sql all in one for dummies

Expert answers By querying the three system tables in any database, you can get the default values for each field in each table. Here is the core query. It returns the default value assigned to each user table in the current database. This query is compatible with SQL 2000 and SQL 2005. 　　 Quote: Copy Code code as follows: SELECT so.name as "Table name", Sc.name as "Column name", SM. TEXT

SQL Union and UNION ALL operatorsThe UNION operator is used to combine the result set of two or more SELECT statements.Note that the SELECT statement inside the UNION must have the same number of columns. The column must also have a similar data type. Also, the order of the columns in each SELECT statement must be the same.Suppose we have a table student that includes the following fields and data:drop tabl

Sometimes, the displayed data is displayed until this month, or the value of all months of the current year until the selected month. SQL month selectlpad (rownum Sometimes, PL/SQL displays the data until this month or the values of all months of the current year until the selected month.

Because the ROOT permission is injected into an SQL statement by micro-seller, basically all data is stored. Micro-seller has ROOT permission for SQL Injection-basically all data is in Http:// B .weimai.com/index.php/wap/Index/order/token/1252359/c_userid/0/skuid/244285/buy_count/1/from/view? Id = 33094Error injection

Tags: des blog http io ar os sp div onOriginal: Deletes all indexes of the specified table, including primary key index, unique index, and normal index, for SQL Server 2005,--Delete all indexes in the specified table--usage: DECLARE @tableName varchar--set @tableName = ' table name '-The table name, replacing--exec Sp_dropindex according to the actual situation @

SQL Server traverses the database file to find all stored procedures that use a table/stored procedure.1 CREATE ProcedureSp_getproc2 @Object_Name Varchar( -) 3 as 4 SetNocount on 5 6 DECLARE @tmptable TABLE 7 ( 8Idint IDENTITY(1,1), 9 [DataBase] Varchar( -), TenNameVarchar( -), OneTypeVarchar( -), ACreate_dateDatetime - ) - the DECLARE @SQLText TABLE - ( -Idi

SQL server queries all the table names and fields in the database. SELECT * FROM INFORMATION_SCHEMA.columns WHERE TABLE_NAME = 'account'SELECT(Case when a. colorder = 1 then d. name else ''end) as table name. -- if the table name is the same, null is returned.A. colorder as field serial number,A. name as field name,(Case when COLUMNPROPERTY (a. id, a. name, 'isidentity ') = 1 then' √ 'else' end) as identity

Tags: io using SP strong data on Problem BS SQLUnion is inefficient because it is being scanned for duplicate values. If the merge does not intentionally delete duplicate rows, then use UNION ALLTwo the number of SQL statement fields to federate must be the same, and the field type is "compatible" (consistent);If we need to display the results of the two SELECT statements as a whole, we need to use the union or UNION

Three keywords in the SQL statement:minus (minus),INTERSECT (intersection), and UNION all (unions); About the concept of the set, the middle school should have learned, not much to say. These three keywords are mainly for the database query results to operate, as its Chinese meaning: two queries, Minus is from the first query results minus the second query results, if there is the intersection of the part

1. Empty all table data in SQL Server database(1) Write the stored procedure script:CREATE PROCEDURESp_deletealldata asEXECsp_msforeachtable' ALTER TABLE? NOCHECK CONSTRAINT All 'EXECsp_msforeachtable' ALTER TABLE? DISABLE TRIGGER All 'EXECsp_msforeachtable' DELETE from? 'EXECsp_msforeachtable' ALTER TABLE? CHECK CONST

The operations of intersect and minus are basically the same as those of Union. Here we will summarize the following: Union: Perform Union operations on two result sets, excluding duplicate rows, and sort the default rules at the same time; Union all: Perform Union operations on the two result sets, including duplicate rows without sorting; Intersect: intersection of two result sets, excluding duplicate rows, and sorting by default rules;

SQL statement MINUS, INTERSECT and UNION ALL, minusintersect Three keywords in an SQL statement:MINUS(Minus ),INTERSECT(Intersection) andUNIONALL (union ); I should have learned about the concept of set. I will not say much about it. These three keywords are mainly used to operate the database query results, just as in the Chinese meaning: Two queries,MINUS is t

SQL Server queries all database names, table names, and field names. For more information, see. SQL Server queries all database names, table names, and field names. For more information, see. 1. Get all database names:SELECT Name FROM Master .. SysDatabases order by Name

(Original) based on the tree structure data stored in the chain of the relational database system, calculate the algorithm of all the nodes of the subtree under a node (t-SQL language implementation) Create Function f_subtree (@ dpcode varchar (9)/* tree structure data, which is used to find the User-Defined Function of all the nodes of the subtree under a node *

only manipulate one table at a time. So what do you do when you actually encounter all the records in the SQL Server database? There are two options:1. According to the order of the deletion, this method in the table very many cases appear very unrealistic, even if the number of tables is not much, but the constraints are more long, you still have to spend a lot of time and energy to study the relationship

Copy codeThe Code is as follows:DECLARE cur CURSORSELECT[Object_name] = s. name + '.' + OBJECT_NAME (A. object_id ),B. nameFROM sys. dm_db_index_physical_stats (DB_ID ('adventureworks'), NULL, null, null) ASJOIN sys. indexes AS BOn a. [object_id] = B. [object_id]And a. [index_id] = B. [index_id]JOIN sys. objects AS oOn a. [object_id] = o. [object_id]JOIN sys. schemas AS sON o. [schema_id] = s. [schema_id]Where a. [index_id]> 0And not exists (SELECT *FROM sys. xml_indexesWhere a. [object_id] = [o

CopyCode The Code is as follows: declare cur cursor Select [Object_name] = S. Name + '.' + object_name (A. object_id ), B. Name From SYS. dm_db_index_physical_stats (db_id ('adventureworks'), null) as Join SYS. indexes as B On a. [object_id] = B. [object_id] And a. [index_id] = B. [index_id] Join SYS. Objects as O On a. [object_id] = O. [object_id] Join SYS. schemas as s On O. [schema_id] = S. [schema_id] Where a. [index_id]> 0 And not exists ( Select * From SYS. xml_indexes Where a. [object_id]

Displays the column information of all tables in SQL SERVER.I am working on a program for importing an Excel file from the SQL server database. I want to read the column information in the database, find a lot of information from the Internet, and finally summarize the ideal SQL statement, after execution, the returned

Search for the names of all tables with a specific value in the database. You can use the following stored procedure to do this. Create procedure DBO. findstring@ String nvarchar (100)As Declare @ SQL nvarchar (4000 );Set @ SQL = N'Declare @ STR nvarchar (4000 );Select@ STR = isnull (@ STR + n'' or ''+ C. Name + n'' like n''' %'+ @ String + '% '''''',C. name +

Copy Code code as follows: CREATE table TB (ID int, value varchar (10)) INSERT into TB values (1, ' AA ') INSERT into TB values (1, ' BB ') INSERT into TB values (2, ' AAA ') INSERT into TB values (2, ' BBB ') INSERT into TB values (2, ' CCC ') Go Create function [dbo]. [F_str] (@id int) returns nvarchar (1000) As Begin declare @str nvarchar (1000) Set @str = ' Select @str = @str + ', ' + cast (value as nvarchar (900)) from TB where id = @id Set @str = Right (@