Sql

Front 1

CREATE TABLE

Back 1

creates a new table. it allows you to specify the name of the table and the name of each column in the table.

CREATE TABLE table_name (column_1 datatype, column_2 datatype, column_3 datatype);

Front 2

INSERT INTO

Back 2

adds a new row to a table.

INSERT INTO table_name (column_1, column_2, column_3) VALUES (value_1, 'value_2', value_3);

Front 3

SELECT

Back 3

queries data from a table.

SELECT column_name FROM table_name;

Front 4

UPDATE

Back 4

edits a row in a table.

UPDATE table_name
SET some_column = some_value
WHERE some_column = some_value;

Front 5

ALTER TABLE

Back 5

changes an existing table.

ALTER TABLE table_name ADD column datatype;

Front 6

DELETE FROM

Back 6

deletes rows from a table.

DELETE FROM table_name WHERE some_column = some_value;

Front 7

AND

Back 7

an operator that combines two conditions. both conditions must be true for the row to be included in the result set.

SELECT column_name ( s )

FROM table_name

WHERE column_1 = value_1

AND column_2 = value_2;

Front 8

AS

Back 8

a keyword in SQL that allows you to rename a column or table using an alias.

SELECT column_name AS 'Alias'

FROM table_name;

Front 9

AVG

Back 9

an aggregate function that returns the average value for a numeric column.

SELECT AVG(column_name)

FROM table_name;

Front 10

BETWEEN

Back 10

used to filter the result set within a certain range. the values can be numbers, text or dates.

SELECT column_name (s)

FROM table_name
WHERE column_name BETWEEN value_1 AND value_2;

Front 11

COUNT

Back 11

a function that takes the name of a column as an argument and counts the number of rows where the column is not NULL.

SELECT COUNT (column_name)
FROM table_name;

Front 12

GROUP BY

Back 12

a clause in SQL that is only used with aggregate functions. it is used in collaboration with the SELECT statement to arrange identical data into groups.

SELECT COUNT (*)
FROM table_name
GROUP BY column_name;

Front 13

INNER JOIN

Back 13

an inner join will combine rows from different tables if the join condition is true.

SELECT column_name(s) FROM table_1

JOIN table_2
ON table_1.column_name = table_2.column_name;

Front 14

LIKE

Back 14

a special operator used with the WHERE clause to search for a specific pattern in a column.

SELECT column_name(s)

FROM table_name
WHERE column_name LIKE pattern;

Front 15

LIMIT

Back 15

a clause that lets you specify the maximum number of rows the result set will have.

SELECT column_name(s)
FROM table_name
LIMIT number;

Front 16

MAX

Back 16

a function that takes the name of a column as an argument and returns the largest value in that column.

SELECT MAX(column_name)
FROM table_name;

Front 17

MIN

Back 17

a function that takes the name of a column as an argument and returns the smallest value in that column.

SELECT MIN(column_name)
FROM table_name;

Front 18

OR

Back 18

an operator that filters the result set to only include rows where either condition is true.

SELECT column_name

FROM table_name
WHERE column_name = value_1
OR column_name = value_2;

Front 19

ORDER BY

Back 19

a clause that indicates you want to sort the result set by a particular column either alphabetically or numerically.

SELECT column_name
FROM table_name
ORDER BY column_name ASC|DESC;

Front 20

OUTER JOIN

Back 20

an outer join will combine rows from different tables even if the join condition is not met. Every row in the left table is returned in the result set, and if the join condition is not me, then NULL values are used to fill in the columns from the right table.

SELECT column_name(s) FROM table_1
LEFT JOIN table_2
ON table_1.column_name = table_2.column_name;

Front 21

ROUND

Back 21

a function that takes a column name and an integer as an argument. it rounds the values in the column to the number of decimal places specified by the integer.

SELECT ROUND(column_name, integer)

FROM table_name;

Front 22

SELECT DISTINCT

Back 22

specifies that the statement is going to be a query that returns unique values in the specified columns.

SELECT DESTINCT column_names FROM table_name;

Front 23

SUM

Back 23

a function that takes the name of a column as an argument and returns the sum of all the values in that column.

SELECT SUM(column_name)
FROM table_name;

Front 24

WHERE

Back 24

a clause that indicates you want to filter the result set to include only rows where the following condition is true.

SELECT column_name(s)
FROM table_name
WHERE column_name operator value;