Recent questions tagged Foreign

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foreign key constraint ON DELETE CASCADE not working in sqlite database on android

I have "days" table created as follows "create table days(" + "day_id integer primary key autoincrement, " + " ... .. please help me out.. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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foreign key constraint ON DELETE CASCADE not working in sqlite database on android

I have "days" table created as follows "create table days(" + "day_id integer primary key autoincrement, " + " ... .. please help me out.. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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foreign keys - Django: getting the list of related records for a list of objects

I have two models related one-to many: class Person(models.Model): name = models.CharField(max_length=255) ... [id].dogs = related_items See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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437 views

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foreign keys - Django: getting the list of related records for a list of objects

I have two models related one-to many: class Person(models.Model): name = models.CharField(max_length=255) ... [id].dogs = related_items See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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360 views

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foreign keys - ERRO 1215. MySql InnoDB

Executing: CREATE TABLE `calls`.`called` ( `date` DATETIME NULL, `rate` VARCHAR(10) NULL, `duration` TIME NULL, `Name ... KEY (`Name`, `Code`)); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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359 views

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foreign keys - How to select SQL results based on multiple tables

I need to select results from one table based on certain matching values in a couple of other tables. I have the ... any idea how to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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390 views

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foreign keys - MySQL RESTRICT and NO ACTION

What's the difference in a MySQL FK between RESTRICT and NO ACTION? From the doc they seem exactly the same. Is this ... ? If so, why have both? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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861 views

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foreign keys - Django suffix ForeignKey field with _id

Suppose I have a field f in my model defined as follows as a foreign key: f = models.ForeignKey(AnotherModel) When ... . How can I achieve that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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407 views

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foreign keys - Does Rails need database-level constraints?

I have the same problem as in the following post. So I am wondering, why doesn't Rails support generating ... supposed to do it manually? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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foreign keys - Django migration error :you cannot alter to or from M2M fields, or add or remove through= on M2M fields

I'm trying to modify a M2M field to a ForeignKey field. The command validate shows me no issues and when ... so any suggestions are welcome. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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457 views

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foreign keys - How to remove constraints from my MySQL table?

I want to remove constraints from my table. My query is: ALTER TABLE `tbl_magazine_issue` DROP CONSTRAINT ... ' at line 1 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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