尝试根据不同表中的日期从表中返回日期时，不确定以下 WHERE 语句是否有效

Question

I have written an sql query, and I've tested it such that, I've come to the conclusion that the WHERE statement is giving me issues.

Scenario: I have a table which contains a list of dates. Lets call this table, table A.

I have a second table which contains table 2 columns, "Start Date" and "End Date" .

What I want to do is, filter the dates in table A which contains a list of dates based on the dates that exist between the "Start Date" and "End Date".

For instance, if "Start Date" - 01/01/2017 and "End Date" is 01/02/2017, then I want to return the dates between the Start Date and End Date from table A which contains all the dates.

Here is the SQL Query I have written:

$query = "SELECT ec.ElecEnergy, ec.GasEnergy, ec.Date, c.ElecCharge, c.GasCharge, ec.User, st.AmountSetElec, st.AmountSetGas,
st.StartDate, st.EndDate, st.TargetElecCharge, st.TargetGasCharge, ua.Username
FROM energyconsumption ec INNER JOIN
useraccount ua
ON ec.User = ua.id
INNER JOIN
energytarget st
ON st.customerID = ua.id INNER JOIN
Charge c
ON ec.ChargeID = c.id
INNER JOIN
energytarget st ON
st.energyID = ec.id
WHERE ec.Date = ec.Date >= st.StartDate AND ec.Date <= st.EndDate
GROUP BY  ec.ElecEnergy, ec.GasEnergy,   c.ElecCharge, c.GasCharge, st.AmountSetElec, st.AmountSetGas, st.StartDate, st.EndDate, ua.Username ";

Question How do I write a WHERE statement that filters for dates in table A based on the dates that exist between the Start Date and End Date in table B.

Thanks!

EDIT:

I tried to use the BETWEEN statement to resolve the statement, this is what I did:

$query = "SELECT ec.ElecEnergy, ec.GasEnergy, ec.Date, c.ElecCharge, c.GasCharge, ec.User, st.AmountSetElec, st.AmountSetGas,
st.StartDate, st.EndDate, st.TargetElecCharge, st.TargetGasCharge, ua.Username
FROM energyconsumption ec INNER JOIN
useraccount ua
ON ec.User = ua.id
INNER JOIN
energytarget st
ON st.customerID = ua.id INNER JOIN
Charge c
ON ec.ChargeID = c.id
INNER JOIN
energytarget st ON
st.energyID = ec.id
WHERE ec.Date BETWEEN ec.Date >= st.StartDate AND ec.Date <= st.EndDate
GROUP BY  ec.ElecEnergy, ec.GasEnergy,   c.ElecCharge, c.GasCharge, st.AmountSetElec, st.AmountSetGas, st.StartDate, st.EndDate, ua.Username ";

Also, could there perhaps be an issue with the statement "

INNER JOIN
    energytarget st ON
    st.energyID = ec.id"

which is just above the WHERE statement

Answer 1

Your query has an error in JOIN clauses:

There are two join clauses with the same alias:

    INNER JOIN energytarget st ON st.customerID = ua.id 
    INNER JOIN energytarget st ON st.energyID = ec.id

SELECT ec.ElecEnergy, ec.GasEnergy, ec.Date, c.ElecCharge, c.GasCharge, 
       ec.User, st.AmountSetElec, st.AmountSetGas, st.StartDate, 
       st.EndDate, st.TargetElecCharge, st.TargetGasCharge, ua.Username
FROM energyconsumption ec 
     INNER JOIN useraccount ua ON ec.User = ua.id
     INNER JOIN energytarget st ON st.customerID = ua.id 
     INNER JOIN Charge c ON ec.ChargeID = c.id
     INNER JOIN energytarget st ON st.energyID = ec.id
WHERE 
    ec.Date = ec.Date >= st.StartDate AND ec.Date <= st.EndDate
GROUP BY ec.ElecEnergy, ec.GasEnergy, c.ElecCharge, 
         c.GasCharge, st.AmountSetElec, st.AmountSetGas, 
         st.StartDate, st.EndDate, ua.Username