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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

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 Here are the five top commonly asked SQL queries in the interviews. These you can expect in Data Analyst, or, Data Engineer interviews. Top SQL Queries for Interviews 01. Joins The commonly asked question pertains to providing two tables, determining the number of rows that will return on various join types, and the resultant. Table1 -------- id ---- 1 1 2 3 Table2 -------- id ---- 1 3 1 NULL Output ------- Inner join --------------- 5 rows will return The result will be: =============== 1  1 1   1 1   1 1    1 3    3 02. Substring and Concat Here, we need to write an SQL query to make the upper case of the first letter and the small case of the remaining letter. Table1 ------ ename ===== raJu venKat kRIshna Solution: ========== SELECT CONCAT(UPPER(SUBSTRING(name, 1, 1)), LOWER(SUBSTRING(name, 2))) AS capitalized_name FROM Table1; 03. Case statement SQL Query ========= SELECT Code1, Code2,      CASE         WHEN Code1 = 'A' AND Code2 = 'AA' THEN "A" | "A

The Exclusive Way to Declare Variables in Oracle Procedure

Declare record type variables in PLSQL

There are four data types in PLSQL. Those are Numeric, Char, Boolean, and Date/Time. Each data type and its features are demonstrated. And explained how to declare variables in PLSQL procedure.

Data types

Here are the four popular data types in PLSQL.

1. Numeric


DEC, DECIMAL, and NUMERIC are used to declare fixed-point numbers with a precision of a maximum of 38 decimal digits. INTEGER, INT, and SMALLINT declare integers with a maximum precision of 38 digits.

2. Char


Char and Varchar data types support storing data of 1 t0 2000 bytes. The VARCHAR2 supports 1 to 4000 bytes of data. The VARCHAR and VARCHAR2 release the unused space in memory,

 3. Date/Time


The range for the Date is from 01-Jan-4712 BC to 31-DEC-9999. It stores the data in date format DD-MON-YYYY. The value is written in single quotes.

4. Boolean


BOOLEAN datatype stores logical values and can be either TRUE or FALSE.

Declare variables


The Declare block in PL/SQL is reserved for variable declaration. The code between begin and end blocks will participate in the execution.


PL/SQL variable-declaration


DECLARE

A NUMBER(4,1) := 11.2; B PLS_INTEGER:=78; C NUMBER(2) :=11; D CHAR(1) :='P'; E varchar (4):='GOOD'; V1 CHAR (1):='T'; D1 DATE:='01-01-2020'; -- Displays current date D2 DATE:=SYSDATE;
BEGIN

Dbms_output.put_line('A:'||' '|| A ); Dbms_output.put_line('B:'||' '|| B); Dbms_output.NEW_LINE; Dbms_output.put_line('C:'||' '|| C); Dbms_output.put_line ('D:'||' '|| D); Dbms_output.NEW_LINE; Dbms_output.put_line('D1' ||CHR(9) ||'Today's DATE '); Dbms_output.put_line(D1|| CHR(9) || D2); Dbms_output.put_line ('V1:'||' '|| V1);
END;

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