| Customization: | Available |
|---|---|
| After-sales Service: | GB/T 12237-2007 |
| Warranty: | 1 Year |
Suppliers with verified business licenses
Audited Supplier Audited by an independent third-party inspection agency
NAl-LOK brand was established in Shanghai in 2000, we focus on the production, research and development, salesof instrumentation valves, fittings, hose & tubing.
The UNION operator in SQL is a powerful tool used to combine the results of two or more SELECT queries into a single result set. Its primary function is to merge rows from different tables or queries while automatically removing duplicate entries, ensuring data consistency and efficiency.
Combines Data Vertically - Unlike joins that merge columns horizontally, UNION stacks rows from multiple queries, provided they have the same number and compatible data types of columns.
Eliminates Duplicates - By default, UNION returns only distinct rows. If duplicates are needed, UNION ALL can be used for faster performance since it skips the deduplication step.
Flexible Data Retrieval - Ideal for consolidating similar data from different tables (e.g., merging customer lists from multiple regions).
Ordering & Filtering Support - UNION can be combined with WHERE, GROUP BY, and ORDER BY clauses for refined results.
| Nickel-Copper Alloy | UNS N04400 (400 Series) | Nickel-Copper Alloy Tube |
| 600 Series | Nickel-Chromium Alloys | UNS N06600, UNS N06601, UNS N06625 |
| 800 Series | Nickel-Iron-Chromium | UNS N08800, UNS N08810, UNS N08811, UNS N08825 |
| Pure Nickel Alloy | - | UNS N02200, UNS N02201 |
| Corrosion-Resistant | - | UNS N10276 (HC276), UNS N06022 (HC22), UNS N06200, UNS N10665 (B2), UNS N10675 (B3) |
| High-Temperature | - | GH3030, GH3039 |
| Other Alloys | - | UNS N08020, UNS N08021, S32205, S32750, S31254 (6Mo/6-Moly), 904L (N08904) |
){kind=link}