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About the SQL FAQ category
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0
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585
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December 30, 2017
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Is there a shorter way to insert multiple rows in a table?
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23
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98131
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March 12, 2021
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How do we search for patterns containing the actual characters "%" or "_"?
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10
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34328
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July 6, 2021
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Can a WHERE clause be applied with a HAVING statement in the same query?
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6
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19598
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June 13, 2021
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When should I use INNER JOIN instead of LEFT JOIN?
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17
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37292
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October 15, 2020
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Can we add a column at a specific position to a table?
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16
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49786
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May 4, 2021
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What are some ways that SQL is used in data science?
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6
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68919
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May 28, 2021
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What happens if tables we perform UNION on have duplicate rows?
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13
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30413
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May 18, 2021
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What are some reasons to apply constraints to a table?
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12
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30889
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May 5, 2020
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Does the order of tables in a JOIN matter?
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4
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23779
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January 28, 2021
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Can we alias multiple columns in a single query?
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9
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40930
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May 19, 2021
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Does COUNT() include duplicate values of a column?
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15
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38336
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April 19, 2021
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What's the difference between COUNT(1), COUNT(*), and COUNT(column_name)?
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9
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27772
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December 7, 2019
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How can we get the average of unique values of a column?
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8
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22901
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January 24, 2021
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Can we use WITH for more than one nested query in SQL?
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13
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13684
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May 4, 2021
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When storing missing data, should I store them as NULL?
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12
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30704
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April 15, 2021
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Can we apply DISTINCT to a SELECT query with multiple columns?
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6
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97886
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July 14, 2021
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How is ALTER different from UPDATE?
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11
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56473
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May 4, 2021
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When should we use each type of JOIN?
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1
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7489
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November 29, 2020
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Can we apply ORDER BY with multiple columns?
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18
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28735
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July 15, 2021
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When applying the BETWEEN operator on TEXT values, how are values compared?
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3
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24100
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July 3, 2020
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What if we only want to delete a specific number of rows?
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28
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41523
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July 14, 2021
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Can we see a database's schema without being given a diagram?
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0
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7271
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November 22, 2018
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When doing an INNER JOIN, are columns matched on NULL values?
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9
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16370
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April 21, 2021
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Do SQL clauses always have to be entirely capitalized?
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8
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36190
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August 19, 2020
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Is the `AND` used in `BETWEEN` the same as the `AND` operator between conditions?
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3
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21903
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January 18, 2021
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Are there guidelines to splitting a table as provided in the example?
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10
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14602
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May 19, 2021
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When using GROUP BY, do we always have to group by a selected column?
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12
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21895
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July 6, 2021
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Where can we access other free datasets?
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1
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6521
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July 13, 2020
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What order are rows selected from a table?
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3
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34810
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January 20, 2021
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