


SQL Server Identity Value Retrieval: A Practical Guide
SQL Server offers several ways to get the identity of a newly inserted row. Each method has its strengths and weaknesses, making the choice dependent on your specific needs. This guide clarifies the differences between @@IDENTITY
, IDENT_CURRENT
, SCOPE_IDENTITY
, and the OUTPUT
clause.
Comparing @@IDENTITY
, IDENT_CURRENT
, and SCOPE_IDENTITY
-
@@IDENTITY
: This function returns the last identity value generated in the current session, regardless of the table. Useful for retrieving the ID from any table within the session, but be wary: it can be affected by triggers or concurrent operations. -
IDENT_CURRENT
: Retrieves the last identity value generated for a specific table, regardless of the session or scope. Ideal when you need the ID for a particular table, even if you didn't insert the row directly. -
SCOPE_IDENTITY
: Returns the last identity value generated within the current session and scope. Generally the best choice for retrieving the ID of a recently inserted row because it's isolated from other concurrent processes within the same statement.
The OUTPUT
Clause: A Powerful Alternative
The OUTPUT
clause provides a direct way to access inserted rows from an INSERT
statement. You can capture identity values, along with other column data, into a table variable or temporary table. While straightforward, it's slightly more complex to use and returns data even if the statement rolls back. Crucially, it executes before triggers, so it won't retrieve trigger-generated identity values. However, it offers the only reliable way to obtain identity values when using parallel processing, guaranteeing their availability regardless of the execution plan.
The above is the detailed content of Which SQL Server Identity Value Retrieval Method (@@IDENTITY, IDENT_CURRENT, SCOPE_IDENTITY, OUTPUT Clause) Should I Use?. For more information, please follow other related articles on the PHP Chinese website!

This article explores optimizing MySQL memory usage in Docker. It discusses monitoring techniques (Docker stats, Performance Schema, external tools) and configuration strategies. These include Docker memory limits, swapping, and cgroups, alongside

This article addresses MySQL's "unable to open shared library" error. The issue stems from MySQL's inability to locate necessary shared libraries (.so/.dll files). Solutions involve verifying library installation via the system's package m

The article discusses using MySQL's ALTER TABLE statement to modify tables, including adding/dropping columns, renaming tables/columns, and changing column data types.

This article compares installing MySQL on Linux directly versus using Podman containers, with/without phpMyAdmin. It details installation steps for each method, emphasizing Podman's advantages in isolation, portability, and reproducibility, but also

This article provides a comprehensive overview of SQLite, a self-contained, serverless relational database. It details SQLite's advantages (simplicity, portability, ease of use) and disadvantages (concurrency limitations, scalability challenges). C

This guide demonstrates installing and managing multiple MySQL versions on macOS using Homebrew. It emphasizes using Homebrew to isolate installations, preventing conflicts. The article details installation, starting/stopping services, and best pra

Article discusses configuring SSL/TLS encryption for MySQL, including certificate generation and verification. Main issue is using self-signed certificates' security implications.[Character count: 159]

Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

Dreamweaver Mac version
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SublimeText3 Mac version
God-level code editing software (SublimeText3)

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
