If Else statement on T-SQL calculated column - sql-server

Question

I have a table I'm creating for an app I'm making and want to populate a calculated column from an IF statement,I don't know how to write the T-SQL for it and have looked for an answer but can't find
What i'm looking for is basically
IF (Close<=Open)
[CloseLessEqualToOpen == Yes]
ELSE
[CloseLessEqualToOpen == No]
T-SQL
CREATE TABLE [dbo].[LowFloatStocks] (
[Id] INT IDENTITY (1, 1) NOT NULL,
[Date] DATE NOT NULL,
[Ticker] NCHAR (10) NOT NULL,
[PreviousClose] DECIMAL (4, 2) DEFAULT ((4.00)) NOT NULL,
[OpeningPrice] DECIMAL (18, 2) NOT NULL,
[GainPercent] AS (round(([High]-[OpeningPrice])/[OpeningPrice],(4))*(100.0)) PERSISTED NOT NULL,
[GapPercent] AS (round(([OpeningPrice]-[PreviousClose])/[PreviousClose],(4))*(100.0)) PERSISTED NOT NULL,
[Spike] DECIMAL (18, 2) NOT NULL,
[1stSpike%] AS (round(([Spike]-[OpeningPrice])/[OpeningPrice],(4))*(100.0)) PERSISTED NOT NULL,
[High] DECIMAL (18, 2) NOT NULL,
[HighPercent] AS (round(([High]-[PreviousClose])/[PreviousClose],(4))*(100.0)) PERSISTED NOT NULL,
[Low] DECIMAL (18, 2) NOT NULL,
[LowPercent] AS (round(([Low]-[PreviousClose])/[PreviousClose],(4))*(100.0)) PERSISTED NOT NULL,
[Close] DECIMAL (18, 2) DEFAULT ((4)) NOT NULL,
[ClosePercent] AS (round(([Close]-[PreviousClose])/[PreviousClose],(4))*(100.0)) PERSISTED NOT NULL,
[CloseLessEqualToOpen] NCHAR (3) NULL,
[CloseRed] NCHAR (3) NULL,
[ClosevHigh] AS (round(([High]-[Close])/[Close],(4))*(100)) PERSISTED NOT NULL,
[ClosevOpen] AS (round(([OpeningPrice]-[Close])/[OpeningPrice],(4))*(100.0)) PERSISTED NOT NULL,
[Catalyst] NVARCHAR (50) NOT NULL,
[Float] DECIMAL (18, 3) NOT NULL,
[Dilution] NCHAR (3) NOT NULL,
PRIMARY KEY CLUSTERED ([Id] ASC)

Answer 1

First of all, you need to get a single value to use in your statement:
DECLARE #Close DECIMAL (18, 2);
SET #Close = (SELECT TOP 1 Close FROM [dbo].[LowFloatStocks]);
For above statement, you can also apply WHERE or any other clause based on your need.
Then use SQL IF statement to do your comparisons, this way:
IF(#Close <= Open) -- assuming that Open is declared somewhere else
BEGIN
-- Your logic here
PRINT #Close
END
ELSE
BEGIN
-- Your logic here
PRINT #Close
END
Later you can update your Table this way:
UPDATE
[dbo].[LowFloatStocks]
SET
CloseLessEqualToOpen = ...
WHERE
...
However, there is also a more elegant solution in case if you want to make the calculation process happen automatically.
For that reason you can use Computed Columns:
CREATE TABLE [dbo].[LowFloatStocks]
(
[Close] DECIMAL (18, 2) DEFAULT ((4)) NOT NULL,
[Open] DECIMAL (18, 2) DEFAULT ((4)) NOT NULL,
-- other columns declaration here
[CloseLessEqualToOpen] AS CAST
(
CASE WHEN [Close] <= [Open] THEN 'Yes' ELSE 'No' END AS NVARCHAR(10)
)
)