sql where multiple conditions

Click here if you want to view the original text. So I made a small modification to the SQL statement to achieve my goal. In my test, the table name is ctest, and the field name is pinyin. This is before sorting: The SQL statement used is as follows: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Update ctest Set mingci = ( Select count (*) + 1 From

Tags: Dev SQL rom table data query data from where deviceSelect(SELECT COUNT (*) from DEVICE0 where status! = 0),(SELECT COUNT (*) from Device1 where status! = 0),(SELECT COUNT (*) from Device2 where status! = 0),(SELECT COUNT (*) from device3 where status! = 0),(SELECT COUNT (*) from Device4 where status! = 0),(SELECT COUNT (*) from device5 where status! = 0),(SELECT COUNT (*) from Device6 where status! = 0),(SELECT COUNT (*) from Device7 where statu

IF object_id('Carddetail') is not NULL DROP TABLECarddetailCREATE TABLECarddetail (IDINT IDENTITY(1,1)PRIMARY KEY, CardnoVARCHAR(8), NAMEVARCHAR( -), IdcardVARCHAR( -), CardstateCHAR(1)--card Status 1 Normal 2 logoff ) INSERTCarddetail (cardno,name,idcard,cardstate)VALUES ('001','Zhang San','31010',1), ('005','Zhang San','31010',1), ('002','John Doe','31011',1), ('003','Harry','31012',1), ('006','Zhang San','31010',0), ('004','Harry','31012',1), ('007','Ouyang','31013',1), ('008','Ouyang','3

The transaction is atomic, either not executed, or fully executed, once a permanent save is successfully executed . and these are due to the atomicity of the transaction and the persistence of the database. . The following is a batch operation that unifies data modifications in a database , Leverage to Transactions . TODO: Bulk modifying data in a database code: #region Extensionmethod///SummaryThe transaction operation is approximate (temperature)BeginTrans: Start transactionCommitTrans: Comm

SQL delete simultaneously deletes records associated with multiple tables Sqlserver supports cascade update and deletion.Oracle only supports cascading Deletion Delete a row that contains the primary key value. This value is referenced by a foreign key column in an existing row of another table. In cascading deletion, all rows whose foreign key value references the deleted primary key value are also deleted

Whether int or varchar is used, it is hard to cope with multiple Status queries. For example, in general thinking, The Enum settings for CustomerStatus are as follows: Copy codeThe Code is as follows: [Serializable] Public enum CustomerStatus { New = 0, Active = 1, Overdue = 2, Sushortded = 3, Closing = 4, Closed = 5 } The Status value is stored in the database as an int.What should I do if I want to search for a Customer in the Active, Overdue, and s

The first step:Build tableCREATE table t1 (x int, y int);CREATE table t2 (x int, y int);GoINSERT into T1 (x, Y) VALUES (2,3), (3,4), (4,5), (5,6);INSERT into T2 (x, Y) values (2,3);GoStep Two:Delete Related rows in the T1 tableDelete aFrom T1 as a inner joins T2 as B on a.x=b.x;Step Three:The second step is to remove the two lines (2,3) from the T1 table. But be careful that the delete here can delete only one table, and you cannot delete multiple tab

Today we're going to talk about the SQL statements about how to query multiple tables, first and foremost, the most common and sudden, and the most abrupt. Multi-Table Query method SELECT * FROM A join B in A.uid=b.uid join C on C.uid=a.uid where uid=1 二、四个 Table Query SELECT * Form a,b,c,d where A.uid=b.uid and B.uid=c.uid and C.uid=d.uid where uid=1 Third, the use of alias query SELECT * FROM table1

Tags: object name nio table ISP character technology VAR conversionConvert table 1 to table 2: Table 1 Table 2 To get the results of table 2, you need to go through several pivot transformations, and then join together by union, the code is as follows: 1 SelectID, type,sum([1])[1],sum([2])[2],sum([3])[3],sum([4])[4] from 2 ( 3 Select 'a' asType* fromTable_14Pivotsum(a) forPinch([1],[2],[3],[4])) asa5 Union All 6 Select 'b' asType* fromTable_17Pivotsum(b) forPinch([1],[2],[3],[4])

SQL Multiple primary key tables, when the inserted data is duplicated, are prompted to violate the primary KEY constraint that cannot be inserted by the error. So, how do I find duplicate values for the inserted data? Workaround: Use Group bySuppose there is a table #a , there are saleid,vendorid,comid,price,saleprice,quantity and other fields. The primary key is: Saleid,vendorid,comid three of them. Assu

Label:Under normal circumstances, PHP's mysql_query function is not able to execute multi-sentence CREATE table and other statements in bulk; And some scenarios, such as having a SQL backup file, or creating a data table structure when the program is initialized, you need to batch execute the SQL statements in the file; To solve this problem, you can use the Explode function to press '; ' The

A multiple-table query is relative to a single table, which refers to querying data from multiple data tables, where we mainly learn how to query data from two data tables. 4.3.1 Unconditional multiple Table query An unconditional multiple table query is a combination of the records of each table in the form of "Cartes

Mysqli has many advantages over mysql. mysqli connects to the database and uses mysqli pre-processing prepare. In addition, mysqli supports multi-query features. Mysqli has many advantages over mysql. mysqli connects to the database and uses mysqli pre-processing prepare. In addition, mysqli supports multi-query features. Mysqli has many advantages over mysql. We recommend that you use it. If you do not know it, you can view the basic mysql Tutorial:And use. In addition, mysqli supports the m

How does mysql execute multiple SQL statements at a time? Lt ;? Php $ SQL quot; SELECT @ a: idFROMcsdnorderbyidasclimit30, 1; SELECT @ B: idFROMcsdnorderbyidasclimit60, 1; SELECT * fromcsdnwhereid gt; @ aand mysql? $ SQL =" SELECT @ a: = id FROM csdn order by id asc limit 30,1; SELECT @ B: = id FROM csdn order

Similar to the following: Select A.key,b.key,c.key from A,b,c where trim (a.key) =trim (B.FK) and trim (A.col) =trim (c.pk). In Table A (more than 200 records), the associated schedule B (more than 40,000 records) was used for 1 seconds, which may vary between machines, but slightly slower than the trim speed, but not particularly noticeable. Its SQL statement resembles the following: Select A.key,b.key from A,b where trim (a.key) =trim (B.FK)

A recent project involving SQL Server 2008, because of business requirements, wanted to establish a unique index, but found that in SQL Server, a unique index field cannot have multiple null values, and the following is an error message:CREATE UNIQUE nonclustered INDEX on 'dbo. Users'weixin_openid_ui'CREATEUNIQUE The INDEX statement terminates. The duplicate

P2p financial security: Multiple SQL injection vulnerabilities on a platform P2p financial security: Multiple SQL injection vulnerabilities on a platform Qian loan Network (www.moneydai.com), as a professional P2P network lending institution, is affiliated to Shenzhen xingrong Internet Financial Service Co., Ltd., a

This article mainly introduces the CI framework AR operation to insert Multiple SQL data records, and analyzes the CI framework using arrays to insert multiple data records in the form of a simple example, for more information about how to insert Multiple SQL data records, s

When using the SQL database, we may need to add multiple records at a time, as shown in the database. We can use SQL statements to implement this. The statement is as follows: -- Add a record Insert into tablename (col1, col2, col3) values (1, 2, 3)-- Add multiple recordsInsert into tablename (col1, col2, col3)Select 3

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