daviddoji-cs50/problems/2024/sql/players@20260415T084958.063479388Z

1.sql

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+-- write a SQL query to find the hometown (including city, state, and country) of Jackie Robinson.
+SELECT "birth_city", "birth_state", "birth_country" FROM "players" WHERE "first_name" = "Jackie" AND "last_name" = "Robinson";

2.sql

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+-- write a SQL query to find the side (e.g., right or left) Babe Ruth hit.
+SELECT "bats" FROM "players" WHERE "first_name" = "Babe" AND "last_name" = "Ruth";

3.sql

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+-- write a SQL query to find the ids of rows for which a value in the column debut is missing.
+SELECT "id" FROM "players" WHERE "debut" IS NULL;

4.sql

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+-- write a SQL query to find the first and last names of players who were not born in the United States.
+-- Sort the results alphabetically by first name, then by last name.
+SELECT "first_name", "last_name" FROM "players" WHERE "birth_country" != "USA" ORDER BY "first_name" ASC, "last_name" ASC;

5.sql

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+-- write a SQL query to return the first and last names of all right-handed batters.
+-- Sort the results alphabetically by first name, then by last name.
+SELECT "first_name", "last_name" FROM "players" WHERE "bats" = "R" ORDER BY "first_name" ASC, "last_name" ASC;

6.sql

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+-- write a SQL query to return the first name, last name, and debut date of players born in Pittsburgh, Pennsylvania (PA).
+-- Sort the results first by debut date—from most recent to oldest—then alphabetically by first name, followed by last name.
+SELECT "first_name", "last_name", "debut" FROM "players" WHERE "birth_city" = "Pittsburgh" ORDER BY "debut" DESC, "first_name" ASC, "last_name" DESC;

7.sql

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+-- write a SQL query to count the number of players who bat (or batted) right-handed and throw (or threw) left-handed, or vice versa.
+SELECT COUNT(*) FROM "players" WHERE "bats" = "R" AND "throws" = "L" OR "bats" = "L" AND "throws" = "R";

8.sql

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+-- write a SQL query to find the average height and weight, rounded to two decimal places, of baseball players who
+-- debuted on or after January 1st, 2000. Return the columns with the name “Average Height” and “Average Weight”, respectively.
+SELECT ROUND(AVG("height"), 2) AS "Average Height", ROUND(AVG("weight"), 2) AS "Average Weight" FROM "players" WHERE "debut" >= "01-01-2000";