How do you assign a SQL query output to a variable in a shell script?

How do you assign the output of an SQL query to a variable?

The syntax for assigning a value to a SQL variable within a SELECT query is @ var_name := value , where var_name is the variable name and value is a value that you’re retrieving. The variable may be used in subsequent queries wherever an expression is allowed, such as in a WHERE clause or in an INSERT statement.

How do you assign a output to a variable in shell scripting?

To store the output of a command in a variable, you can use the shell command substitution feature in the forms below: variable_name=$(command) variable_name=$(command [option …] arg1 arg2 …) OR variable_name=’command’ variable_name=’command [option …] arg1 arg2 …’

How do you assign a SQL query output to a variable in UNIX?

Linux: Store SQL Query Result in a Variable in Shell Script

  1. #!/bin/bash c_ename=`sqlplus -s SCOTT/tiger@//YourIP:1521/orcl <<END set pagesize 0 feedback off verify off heading off echo off select ename from emp where empno = 7566; exit; END` echo “Employee name is $c_ename for employee code 7566.”
  2. chmod +x sqltest.
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How do you store the results of Hive query in a variable in a shell script?

./hive -e “use telecom;insert overwrite local directory ‘/tmp/result’ select avg(a) from abc;” ./hive –hiveconf MY_VAR =`cat /tmp/result/000000_0`;

How do you declare a variable in SQL and use it in query?

Variables in SQL procedures are defined by using the DECLARE statement. Values can be assigned to variables using the SET statement or the SELECT INTO statement or as a default value when the variable is declared. Literals, expressions, the result of a query, and special register values can be assigned to variables.

How do I assign a variable in MySQL?

MySQL variable assignment

There are two ways to assign a value to a user-defined variable. You can use either := or = as the assignment operator in the SET statement. For example, the statement assigns number 100 to the variable @counter. The second way to assign a value to a variable is to use the SELECT statement.

How do you get the output of a shell script in a file?

To use bash redirection, you run a command, specify the > or >> operator, and then provide the path of a file you want the output redirected to. > redirects the output of a command to a file, replacing the existing contents of the file.

How do you declare a variable in Shell?

To declare a variable, just type the name you want and set its value using the equals sign ( = ). As you can see, to print the variable’s value, you should use the dollar sign ( $ ) before it. Note that there are no spaces between the variable name and the equals sign, or between the equals sign and the value.

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How do you set a variable in a bash script?

To create a variable, you just provide a name and value for it. Your variable names should be descriptive and remind you of the value they hold. A variable name cannot start with a number, nor can it contain spaces. It can, however, start with an underscore.

How do I redirect output to a file in SQL?

Getting Started

  1. If you want to save the results in a txt file, you can do this in SSMS. Go to Tools>Options:
  2. Select the option Result to file:
  3. Create a query and execute the query. …
  4. The result saved are the following:
  5. SQLCMD. …
  6. PowerShell. …
  7. Import/Export Wizard in SSMS. …
  8. You will open the SQL Server Import and Export wizard:

How do I run a Sqlplus script in Linux?

Now lets dig deep!

  1. sqlplus user/pass@TNS_ALIAS. This is the most basic way to start sqlplus and connect to a database defined by the TNS_ALIAS in the tnsnames. …
  2. sqlplus username@TNS_ALIAS. …
  3. sqlplus /nolog. …
  4. sqlplus / as sysdba. …
  5. sqlplus -s. …
  6. sqlplus wrapper script.

How do I run a SQL script in Oracle?

To execute a script from the SQL Scripts page:

  1. On the Workspace home page, click SQL Workshop and then SQL Scripts. The SQL Scripts page appears.
  2. Click the View Report icon. …
  3. In the far right column, click the Run icon for the script you want to execute. …
  4. Click Run Now to submit the script for execution.

How do I assign a variable in hive?

Hive variables are key-value pairs that can be set using the set command and they can be used in scripts and Hive SQL. The values of the variables in Hive scripts are substituted during the query construct.

2. Create and Set Hive variables

  1. hiveconf.
  2. hivevar.
  3. system, and.
  4. env.
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How do I store Hive query results?

To directly save the file in HDFS, use the below command: hive> insert overwrite directory ‘/user/cloudera/Sample’ row format delimited fields terminated by ‘t’ stored as textfile select * from table where id >100; This will put the contents in the folder /user/cloudera/Sample in HDFS.

How do you set a variable in Hive query?

If you do not provide namespace as mentioned below, variable var will be stored in hiveconf namespace. set hivevar_var=”hivevar_namespace”; as we are providing the namespace this will work. select ${hivevar:var};

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