Preventing Data Drift with SQL Guardrails

#WittyWednesday #BehaviouralBias 400 SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'f0lr0' for key 'links_short_url_unique' (SQL: insert into `links` (`short_url`, `long_url`, `long_url_hash`, `ip`, `is_custom

#WittyWednesday #BehaviouralBias 400 SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'f0lll' for key 'links_short_url_unique' (SQL: insert into `links` (`short_url`, `long_url`, `long_url_hash`, `ip`, `is_custom

#WittyWednesday #BehaviouralBias 400 SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'f0lcp' for key 'links_short_url_unique' (SQL: insert into `links` (`short_url`, `long_url`, `long_url_hash`, `ip`, `is_custom

#WittyWednesday #BehaviouralBias 400 SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'eo9ng' for key 'links_short_url_unique' (SQL: insert into `links` (`short_url`, `long_url`, `long_url_hash`, `ip`, `is_custom

Pen-test horror story: SQL injection → command shell → cracked passwords — why risk acceptance and infrequent retests leave companies exposed

Clean Them Up — But Choose Wisely! Using the wrong SQL command can slow performance or erase more than you intended. Here's the essential breakdown: DELETE ✔ Selective row removal (supports WHERE) ✔ Keeps table and structure ✖ Slow for large datasets TRUNCATE ✔ Removes all rows ✔ Resets identity counters ✔ Faster than DELETE ✖ No WHERE clause ✖ Minimal logging DROP ✔ Deletes table and structure ✔ Frees up space ✖ Irreversible if auto-commit is on ✖ Table is gone 💡 When to Use What - DELETE for precision - Use TRUNCATE for speed - Use DROP when the table’s done for #DataAnalyst #SQL #DataHandling #MySQL #DataScience

SQL Challenge Question 👇 ✅Explanation 1. WHERE DATE(fall_time) = '2025-12-24' fall_time is probably a timestamp (date + time). DATE(fall_time) extracts only the date part. 2. DISTINCT flake_type This removes duplicates. 3. COUNT(DISTINCT flake_type) This counts how many different types are in that list. 4. AS unique_snowFlakes This gives the output column a readable name.

SQL: Find consecutive login streaks in SQL server. Given a table of user login records, we want to identify streaks of consecutive daily logins for each user. A streak is defined as one or more days where the user logged in on consecutive calendar dates. 📊 Sample Table: Login(id, login_date) 🧠 SQL Concepts Covered: Common Table Expressions (CTEs) ROW_NUMBER() window function The "Gaps and Islands" technique Grouping and aggregating streaks https://lnkd.in/gMPBnuGv

SQL Quick Tip: DELETE vs. TRUNCATE 🧹 When you need to remove data from a table, picking the right command is key for performance and accuracy. Here is the simple breakdown: DELETE is like a scalpel. Best for: Removing specific rows using a WHERE clause. How it works: It deletes rows one by one, which makes it slower for huge tables. Identity: It keeps your ID counter where it is. If your last ID was 100, the next one will be 101. Safety: It fires triggers and logs every row removed. TRUNCATE is like a sledgehammer. Best for: Wiping an entire table clean instantly. How it works: It deallocates the data pages rather than looking at individual rows, making it incredibly fast. Identity: It resets your ID counter. If you start over, your first new row will be ID 1. Safety: It generally ignores triggers and uses less logging space. The Rule of Thumb: Use DELETE if you have a specific target. Use TRUNCATE if you want a fresh start. #SQL #Data #Programming #DatabaseTips

Do you know the difference between CHAR and VARCHAR in a database? VARCHAR: It is variable length string. That means users only actual data size but for performance it is slightly slower. example: email VARCHAR(100) demo@example.com, firstdemoemail@example.com so in these case if we declare VARCHAR actual data size will be as per email length. CHAR: It is fixed lenght string. in terms of storage is always uses declared size. it is slightly faster then varchar. example: password CHAR (32) $A$005$THISISACOMBINATIONOFINVALIDS, $A$005$THISI for these password it alwys uses fixed size storage which is defined. #DB #DATABSE #DATATYPE #CODE #SQL