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Tags: emptying data for all tables in a database using SQL statementsRecently found that the database is too large, the space is not enough, so it is intended to complete the database of data cleanup, but the table is very many, one by one empty, it is really troublesome, so you want to use SQL statements to clear
DECLARE @tablename varchar (200)DECLARE @sql varchar (2000)DECLARE cur_t cursor FORSelect name from sysobjects where xtype= ' U ' and status> =0 and name is not in (select name from sysobjects where ID in ( Select ID from syscolumnswhere ID in (select id from sysobjects where type= ' U ')and Name= ' Createtime '))Open cur_tFETCH NEXT from cur_t to @tablenameWhile @ @FETCH_STATUS = 0BeginSet @sql = ' ALTER T
data tables-----3. How to insert data------1) Insert the data into the temporary table---Insert into#Temp_Student (Age,name)Values( +,'Zhang San'),( A,'John Doe') --2) Insert the data into the data table---Insert intoData_student (Age,name)Values( at,'Harry'),( -,'Zhao Liu')4. How to query temporary tables and data table data-- ---4, how to query the data------- -- 1) Query the temporary table-- Selec
SQL's self-increment column is very easy to use, just the development process once deleted data, the identity column is not continuous write up is also very depressed, so looked up the identification column reset method found can be divided into three kinds:---Delete the original table data and reset the self-increment columnTRUNCATE TABLE tablename--truncate mod
Label:If you set a column to identity when you create a new table, you can not display the specified value when inserting the data, and SQL Server automatically populates the value of that column. Create Table TblPerson1
(
IntIdentity(1,1Primarykey not Null ,
Nvarchar (null
) At this point, the following code
-- SQL creates a primary key for all user data tables in the database-- Primary key Description: The name is ID, and the data type is Integer auto-increment.
-- Query all constraints of the current database before creationSelect * From information_schema.key_column_usage
Declare @ tablename nvarchar (250)Declare @
creation date.
Ftcatid
Smallint
The full-text directory identifier of all user tables registered with full-text indexes. The value is 0 for all user tables not registered.
Schema_ver
Int
The version number that is added each time you change the schema of a table. Always Returns 0.
, which are numbered from 75124 to 75132. This is 9 special orders, each with more than 120,000 detailed records. In other words, dbo. 90% of the data in Salesorderdetail_test will be in these 9 orders. The main use of "select [email protected]" to search out Sales.SalesOrderDetail all records inserted into Dbo.salesorderdetail. Executed 9 times altogether.
2.3 Table ScanThere are two types of tables i
SQL server determines whether a database, table, column, or view exists. SQL server
1. Determine whether the database exists
If exists (select * from sys. databases where name = 'database name ')Drop database [database name]
2. Check whether the table exists.
If exists (sele
For example, if a table is like this, the ID is the primary key and the table is auto-incrementing:
Column name: Id Columna columnb columnc
Column value: 1 A asdfd afdsf
2 B sdfafsd 080dfs
3 A dfsafja08 90879.
4 C fds934 fsdaf
5 B safsfsd fd86fsdaf
The query results after the SQL statement is executed are as follows:
Column
on each row and points to the page where the data resides. He looks like a Chinese dictionary based on the ' radicals ' to find the word, even if the data is not sorted, but he has a directory more like a directory, the efficiency of data extraction is also a room for improvement, without the need for a full table scan.A table can have multiple nonclustered indexes, and each nonclustered index provides a different sort order based on the different in
respect for the original: http://blog.csdn.net/love_java_cc/article/details/52234889There are tables as follows Table3:Need to query the number of occurrences in each country in countrySQL statements:[SQL]View PlainCopy
SELECT country as countries,count (*) as many times from table3 GROUP by country
The results are as follows:Knowledge Points:COUNT (*) counts the total number of bars in
You can access SQL Server through ado, and execute corresponding SQL statements to create databases and tables. The following are definitions in SQL Server books online.
Table creation:
Create Table[Database_name. [owner].|
Oracle:SELECT * from tables with permissions in the all_tables;--system SELECT * from dba_tables;--system table SELECT * from user_tables;--the table under the current userSQL Server1, using the sysobjects system table in this table, each object created in the database (for example, constraints, defaults, logs, rules, and stored procedures) has a row, and we filter out all the records in the table that a
SQLServer how to use the T-SQL command to query a database in which tables, convenient table operations, need friends can refer to the next
SQLServer how to use the T-SQL command to query a database in which tables, convenient table operations, need friends can refer to the next
1. query
problem: when modifying the database table, can not choose to save, prompt: Saving changes is not permitted, such as 1, if you choose Cancle, will be revoked save, if you choose Save Text file, will save a txt files, But not SQL script, personally feel useless.Workaround: Do not catch the urgency, this is because you set the save changes when rebuilding the table (which is usually the default)1. Go back to the SQL
The following two tables have the same structure. use SQL to find columns with different values.
Student_1
NAME
AGE
SCORE
Peter
26
100
Jack
25
96
Daniel
26
48
Bark
21
69
Student_2
NAME
AGE
SCORE
Peter
26
89
Jack
25
96
Daniel
In the transfer database, data import, encountered a problem, is the table foreign key constraints exist, resulting in frequent error inserts, batch execution SQL statements are sequential execution, no way I had to manually input.
Then enter the half of the flash, why not first the foreign key constraints are all disabled first?
So I Baidu to the following information:
Oracle Delete (
-- SQL batch update all user data tables in the database with the field type tinyint as int
-- Key notes:-- 1. query all xtype = '48' records in the system table syscolumns to obtain fields of the type [tinyint ].-- 2. If the field has a default index before updating the field type, delete the corresponding index first
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