Find all invoice dates corresponding to customers with first name Astrid and last name Gruber, and count them by a bar chart
CREATE TABLE PlaylistTrack (
    PlaylistId integer,
    TrackId integer
)

CREATE TABLE Genre (
    GenreId integer,
    Name varchar(120)
)

CREATE TABLE Album (
    AlbumId integer,
    Title varchar(160),
    ArtistId integer
)

CREATE TABLE MediaType (
    MediaTypeId integer,
    Name varchar(120)
)

CREATE TABLE Employee (
    EmployeeId integer,
    LastName varchar(20),
    FirstName varchar(20),
    Title varchar(30),
    ReportsTo integer,
    BirthDate datetime,
    HireDate datetime,
    Address varchar(70),
    City varchar(40),
    State varchar(40),
    Country varchar(40),
    PostalCode varchar(10),
    Phone varchar(24),
    Fax varchar(24),
    Email varchar(60)
)

CREATE TABLE Invoice (
    InvoiceId integer,
    CustomerId integer,
    InvoiceDate datetime,
    BillingAddress varchar(70),
    BillingCity varchar(40),
    BillingState varchar(40),
    BillingCountry varchar(40),
    BillingPostalCode varchar(10),
    Total decimal(10,2)
)

CREATE TABLE Track (
    TrackId integer,
    Name varchar(200),
    AlbumId integer,
    MediaTypeId integer,
    GenreId integer,
    Composer varchar(220),
    Milliseconds integer,
    Bytes integer,
    UnitPrice decimal(10,2)
)

CREATE TABLE Playlist (
    PlaylistId integer,
    Name varchar(120)
)

CREATE TABLE Artist (
    ArtistId integer,
    Name varchar(120)
)

CREATE TABLE InvoiceLine (
    InvoiceLineId integer,
    InvoiceId integer,
    TrackId integer,
    UnitPrice decimal(10,2),
    Quantity integer
)

CREATE TABLE Customer (
    CustomerId integer,
    FirstName varchar(40),
    LastName varchar(20),
    Company varchar(80),
    Address varchar(70),
    City varchar(40),
    State varchar(40),
    Country varchar(40),
    PostalCode varchar(10),
    Phone varchar(24),
    Fax varchar(24),
    Email varchar(60),
    SupportRepId integer
)
SELECT InvoiceDate, COUNT(InvoiceDate) FROM Customer AS T1 JOIN Invoice AS T2 ON T1.CustomerId = T2.CustomerId WHERE T1.FirstName = "Astrid" AND LastName = "Gruber"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Find all invoice dates corresponding to customers with first name Astrid and last name Gruber, and count them by a bar chart ### Input: CREATE TABLE PlaylistTrack (
    PlaylistId integer,
    TrackId integer
)

CREATE TABLE Genre (
    GenreId integer,
    Name varchar(120)
)

CREATE TABLE Album (
    AlbumId integer,
    Title varchar(160),
    ArtistId integer
)

CREATE TABLE MediaType (
    MediaTypeId integer,
    Name varchar(120)
)

CREATE TABLE Employee (
    EmployeeId integer,
    LastName varchar(20),
    FirstName varchar(20),
    Title varchar(30),
    ReportsTo integer,
    BirthDate datetime,
    HireDate datetime,
    Address varchar(70),
    City varchar(40),
    State varchar(40),
    Country varchar(40),
    PostalCode varchar(10),
    Phone varchar(24),
    Fax varchar(24),
    Email varchar(60)
)

CREATE TABLE Invoice (
    InvoiceId integer,
    CustomerId integer,
    InvoiceDate datetime,
    BillingAddress varchar(70),
    BillingCity varchar(40),
    BillingState varchar(40),
    BillingCountry varchar(40),
    BillingPostalCode varchar(10),
    Total decimal(10,2)
)

CREATE TABLE Track (
    TrackId integer,
    Name varchar(200),
    AlbumId integer,
    MediaTypeId integer,
    GenreId integer,
    Composer varchar(220),
    Milliseconds integer,
    Bytes integer,
    UnitPrice decimal(10,2)
)

CREATE TABLE Playlist (
    PlaylistId integer,
    Name varchar(120)
)

CREATE TABLE Artist (
    ArtistId integer,
    Name varchar(120)
)

CREATE TABLE InvoiceLine (
    InvoiceLineId integer,
    InvoiceId integer,
    TrackId integer,
    UnitPrice decimal(10,2),
    Quantity integer
)

CREATE TABLE Customer (
    CustomerId integer,
    FirstName varchar(40),
    LastName varchar(20),
    Company varchar(80),
    Address varchar(70),
    City varchar(40),
    State varchar(40),
    Country varchar(40),
    PostalCode varchar(10),
    Phone varchar(24),
    Fax varchar(24),
    Email varchar(60),
    SupportRepId integer
) ### Response: SELECT InvoiceDate, COUNT(InvoiceDate) FROM Customer AS T1 JOIN Invoice AS T2 ON T1.CustomerId = T2.CustomerId WHERE T1.FirstName = "Astrid" AND LastName = "Gruber"