Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallOracle groups SQL statements into six categories: data definition language (DDL), data manipulation language (DML), transaction control, session control, system control, and embedded SQL. The important wrinkle is that Oracle classifies SELECT as DML, even though it reads data rather than changing data stored in the database. DDL also has a different transaction effect: Oracle Database 26 says it implicitly commits the current transaction before and after each DDL statement.
Oracle’s six SQL statement categories
Oracle’s Database 26 Concepts overview groups SQL by what a statement does or where it operates. The Oracle Database 19c SQL Language Reference lists representative statements in each category. The examples below are representative, not an exhaustive list for every Oracle release.
| Category | What it does | Representative Oracle statements |
|---|---|---|
| DDL (Data Definition Language) | Creates, changes, or removes schema objects and manages related privileges and roles. | CREATE, ALTER, DROP, GRANT, REVOKE, TRUNCATE |
| DML (Data Manipulation Language) | Queries or manipulates data in existing schema objects. | SELECT, INSERT, UPDATE, DELETE, MERGE, CALL, EXPLAIN PLAN, LOCK TABLE |
| Transaction control | Sets transaction properties or commits, rolls back, or marks transaction work. | COMMIT, ROLLBACK, SAVEPOINT, SET TRANSACTION, SET CONSTRAINT |
| Session control | Changes properties of the current user session. | ALTER SESSION, SET ROLE |
| System control | Changes properties of the database instance. | ALTER SYSTEM |
| Embedded SQL | Places SQL statements inside a procedural-language program. | Embedded DDL, DML, and transaction-control statements |
Is SELECT DML in Oracle?
Yes. Oracle’s SQL Language Reference places SELECT in DML and calls it a “limited form of DML.” A query can access data and manipulate the data it accesses before returning results, but SELECT does not change data stored in the database.
Some teaching materials use “DQL” (Data Query Language) as a separate label for queries. That is an alternate instructional convention, not a separate category in Oracle’s six-part classification. For Oracle terminology, treat SELECT as DML.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Why DDL’s transaction behavior matters
DDL is not interchangeable with DML when you have uncommitted work. Oracle Database’s 26 SQL Language Reference, Chapter 10, “Types of SQL Statements”, states: “The database implicitly commits the current transaction before and after every DDL statement.” In contrast, Oracle Database 19c’s SQL Language Reference says DML statements do not implicitly commit the current transaction.
This means a DDL statement can commit earlier work in the transaction as well as its own schema change; a later rollback cannot undo that prior work. If your application depends on precise transaction behavior, use the SQL Language Reference for the database release you run.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
What transaction-control statements do
A transaction is a sequence of statements the database treats as one unit. Oracle’s Database 21c Development Guide describes transactions and their controls:
COMMITends the transaction and makes its changes permanent.ROLLBACKundoes all or part of the transaction’s work.SAVEPOINTmarks a point to which you can later roll back without undoing all work since the transaction began.SET TRANSACTIONandSET CONSTRAINTare also listed as transaction-control statements in the Oracle 19c reference.
Example: group related DML
Suppose a manager leaves and you need to record the departure in JOB_HISTORY and update the affected employees’ MANAGER_ID values. Treat the related inserts and updates as one transaction: commit when all required changes succeed, or roll back if the operation must be abandoned. A savepoint can provide a partial rollback point within that work.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Session control versus system control
The scope distinguishes these categories. ALTER SESSION and SET ROLE affect the current session; ALTER SYSTEM affects database-instance properties. Thus, session control changes the context of one connection, while system control applies at the instance level. Oracle identifies ALTER SYSTEM as its system-control statement in the cited references.
Embedded SQL and PL/SQL boundaries
Embedded SQL means SQL statements incorporated into a procedural-language program; it describes how SQL is used, rather than a new kind of operation alongside creating objects or changing data. Oracle’s SQL Language Reference also gives support boundaries: the cited 19c documentation says session-control statements and ALTER SYSTEM are not supported in PL/SQL, while transaction-control support has exceptions for certain forms of COMMIT and ROLLBACK. DDL can be supported in PL/SQL through DBMS_SQL. These details are release- and statement-specific, so check the documentation matching your database version before relying on them.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
SQL classification is not the same as OCI processing
Oracle’s SQL reference classifies statements by language function. Oracle Call Interface (OCI) documentation describes categories for client processing: DDL, control statements (transaction, session, and system), queries, DML, PL/SQL, and embedded SQL. It says OCI applications process transaction, session, and system control statements as if they were DML. That is an OCI handling convention; it does not replace Oracle’s SQL-language taxonomy.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
