primary-key

问题 I have got a table with auto increment primary key. This table is meant to store millions of records and I don't need to delete anything for now. The problem is, when new rows are getting inserted, because of some error, the auto increment key is leaving some gaps in the auto increment ids.. For example, after 5, the next id is 8, leaving the gap of 6 and 7. Result of this is when I count the rows, it results 28000, but the max id is 58000. What can be the reason? I am not deleting anything.

问题 I am testing the iText 7.1.2.0 library to sign pdf files, using a digital certificate or smart card (X509Certificate2) in a C # project. But I'm getting this error when I try to create the IExternalSignature. According to the documentation found (here, here and here), the way to achieve this process is using the BouncyCastle library that allows extracting the primary keys from the digital certificate, however, it is giving me an error and I can not find another way to do it. In the

问题 I have created two tables and also created a relationship between them. Table students : create table students ( [StudentId] NVARCHAR(50) NOT NULL PRIMARY KEY, [Name] NVARCHAR(50) NOT NULL ); Table studentprofile : create table studentprofile ( [Id] INT NOT NULL PRIMARY KEY IDENTITY(1, 1), [StudentId] NVARCHAR(50) NOT NULL, [Address] NVARCHAR(50) NOT NULL, ); and relationship: alter table studentprofile add constraint students_studentprofile_FK foreign key (StudentId) references students

问题 I would like to update an old table that have a composite primary key. In order to generate a full update query such as: UPDATE foos SET (...) WHERE pk1 = ? AND pk2 = ?; Instead Eloquent tries to do the following which does massive update: UPDATE foos SET (...) WHERE pk1 = ?; I set the primary key attribute to null as seen on Google: class Foo extends Model { protected $guarded = []; protected $primaryKey = null; public $incrementing = false; public $timestamps = false; } But I get this error

问题 I would like to update an old table that have a composite primary key. In order to generate a full update query such as: UPDATE foos SET (...) WHERE pk1 = ? AND pk2 = ?; Instead Eloquent tries to do the following which does massive update: UPDATE foos SET (...) WHERE pk1 = ?; I set the primary key attribute to null as seen on Google: class Foo extends Model { protected $guarded = []; protected $primaryKey = null; public $incrementing = false; public $timestamps = false; } But I get this error

问题 I would like to update an old table that have a composite primary key. In order to generate a full update query such as: UPDATE foos SET (...) WHERE pk1 = ? AND pk2 = ?; Instead Eloquent tries to do the following which does massive update: UPDATE foos SET (...) WHERE pk1 = ?; I set the primary key attribute to null as seen on Google: class Foo extends Model { protected $guarded = []; protected $primaryKey = null; public $incrementing = false; public $timestamps = false; } But I get this error

问题 TABLE_PRD CREATE TABLE TABLE_PRD ( PRODUCT_CODE_PRD VARCHAR2(10) NOT NULL , DESCRIPTION_PRODUCT_PRD VARCHAR2(20) , CONSTRAINT TABLE_PRD_PK PRIMARY KEY ( PRODUCT_CODE_PRD ) ENABLE ); INSERT INTO TABLE_PRD (PRODUCT_CODE_PRD, DESCRIPTION_PRODUCT_PRD) VALUES ('LS', 'Leasing'); INSERT INTO TABLE_PRD (PRODUCT_CODE_PRD, DESCRIPTION_PRODUCT_PRD) VALUES ('TG', 'Total Cost'); TABLE_POS CREATE TABLE TABLE_POS ( POSITION_CODE_POS INTEGER NOT NULL , SOME_TEXT_POS VARCHAR2(20) , CONSTRAINT TABLE_POS_PK

问题 I am currently working on a database, where a log is required to track a bunch of different changes of data. Stuff like price changes, project status changes, etc. To accomplish this I've made different 'log' tables that will be storing the data needing to be kept. To give a solid example, in order to track the changing prices for parts which need to be ordered, I've created a Table called Part_Price_Log . The primary key is composite made up of the date in which the part price is being

问题 I am currently working on a database, where a log is required to track a bunch of different changes of data. Stuff like price changes, project status changes, etc. To accomplish this I've made different 'log' tables that will be storing the data needing to be kept. To give a solid example, in order to track the changing prices for parts which need to be ordered, I've created a Table called Part_Price_Log . The primary key is composite made up of the date in which the part price is being

问题 I am currently working on a database, where a log is required to track a bunch of different changes of data. Stuff like price changes, project status changes, etc. To accomplish this I've made different 'log' tables that will be storing the data needing to be kept. To give a solid example, in order to track the changing prices for parts which need to be ordered, I've created a Table called Part_Price_Log . The primary key is composite made up of the date in which the part price is being