Tags: switch ast service generation REST NULL stack cannot overflowThe model cannot be generated because the following exception exists: ' System.Data.StrongTypingException: The Value of column ' IsPrimaryKey ' in table ' Tabledetails ' is DBNull. ---> system.invalidcastexception: The specified conversion is not valid. Original link Http://stackoverflow.com/questions/33575109/mysql-entity-the-
|--------------------------------------------------------------------------| 0 | select statement | 1 | 23 (5) | 00:00:01 || 1 | sort aggregate | 1 || 2 |INDEX FAST FULL SCAN| IDX_TEST | 41791 | 23 (5) | 00:00:01 |--------------------------------------------------------------------------
/* 2. Change the structure of the test table, set the object_id field to NULL, and update the data to NULL/
Alter table test MODIFY object_id number null;
Trigger that automatically updates date columns with values of Max date without CREATETRIGGERautosettimeasmaxONdbo. statusafterINSERT, UPDATEASUPDATEdbo. statusSETmytime9999-12-3123: 59: 59.000 WHEREidIN (SELECTidFROMinserted)
TRIGGER without create trigger autosettimeasmaxON dbo that automatically updates the date column value to the maximum date. statusafter INSERT, updateas
Yesterday, colleagues export data, has been easy to use the file, has been reporting the error: ORA-12899: value too large for column, originally thought that the program changes caused by the length of the field changed, the structure of a table is changed. The result is good. If you export the next table, an error is returned .. If an error is reported, it is determined that it is not a program issue, but
Oracle copy column Value
Requirement: Add a field to an existing table in the test environment, and manually add data to this column of some data in the table, now you want to add this field in the formal environment and copy the existing values in the testing environment to the formal environment. Since the test environment and the formal environment have the s
In the production environment, the project has been launched, but the update time field is not assigned a value. that is to say, the update time of this data item is still null every time it is updated. To solve this problem, the update time is usually updated when the program updates data. However, after the data is r
Use the following code at the beginning:
alter proc getSerialNO@TYPE VARCHAR(2),@serialNO VARCHAR(10) OUTPUTASif (upper(@type) ='TR')begin select @serialNO = SERIALNO from tb_trserialno set @serialNO = @serialNO + 1 update tb_trserialno set SERIALNO = @serialNO ,LASTUPDATE = CONVERT(VARCHAR,GETDATE(),120)end
Error:
When the varchar value is converted to '123', the integer
Tags: MySQL field value auto update timeIt may appear in the production environment, the project is online, but the Update Time field is not assigned, that is, the update time is still null each time the data is updated. In order to solve this problem, the update time is usu
You need to update the field value to a null value of ' None '
The first way to think about it is
Update ' client ' Set ' company ' = ' None ' WHERE ' company ' = NULL
Error results
The correct approach is to use the IS null condition
Update ' client ' Set ' company ' =
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