Showing posts with the label visualization charts

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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

 Here are the five top commonly asked SQL queries in the interviews. These you can expect in Data Analyst, or, Data Engineer interviews. Top SQL Queries for Interviews 01. Joins The commonly asked question pertains to providing two tables, determining the number of rows that will return on various join types, and the resultant. Table1 -------- id ---- 1 1 2 3 Table2 -------- id ---- 1 3 1 NULL Output ------- Inner join --------------- 5 rows will return The result will be: =============== 1  1 1   1 1   1 1    1 3    3 02. Substring and Concat Here, we need to write an SQL query to make the upper case of the first letter and the small case of the remaining letter. Table1 ------ ename ===== raJu venKat kRIshna Solution: ========== SELECT CONCAT(UPPER(SUBSTRING(name, 1, 1)), LOWER(SUBSTRING(name, 2))) AS capitalized_name FROM Table1; 03. Case statement SQL Query ========= SELECT Code1, Code2,      CASE         WHEN Code1 = 'A' AND Code2 = 'AA' THEN "A" | "A

10 Best Visualization Charts to Present data

Here are the best data visualization chart examples. With these one can present the Data. So  data visualization is the best way to do that. These charts help you understand the visualization concept quickly. 10 Best Visualization Charts to Present data 10 Visualization Charts With Examples. Pie charts Histograms Scatter plots Timetable charts Venn diagrams Steam graphs Stacked area graphs Stacked bar graphs Parallel sets Multi-set bar charts Pie Charts Best Example: The real usage of Pie-charts is to find information about different groups. The complete data to draw Pie chart. Histograms Best Example The purpose of the Histogram is to know the frequency distribution. The complete data to draw Histogram Scatter Plots Best Example: The best example is to find the data scattering and to study the patterns. Useful in the study of medical data. The complete data to draw a Scatter plot. Time Table Charts Best Example The best example is Schools, Colleges, and Offices. Venn diagrams Best Ex