How to write the stored procedure of Oracle query

The steps to create a query stored procedure in Oracle are as follows: Create a stored procedure: Use the CREATE OR REPLACE PROCEDURE statement to write a stored procedure and define input and output parameters (optional). Define input and output parameters (optional): Use the CREATE OR REPLACE PROCEDURE statement to define the names and data types of the input and output parameters of the stored procedure. Execute a stored procedure: Use the EXECUTE statement to execute a stored procedure, passing input parameters, and storing the output parameters in variables.

How to create a query stored procedure in Oracle

Step 1: Create a stored procedure

<code class="oracle">CREATE OR REPLACE PROCEDURE stored_procedure_name
AS
BEGIN
  -- 在这里编写你的查询代码
END;</code>

Step 2: Define input and output parameters (optional)

<code class="oracle">CREATE OR REPLACE PROCEDURE stored_procedure_name (
  -- 定义输入参数
  input_parameter_name IN datatype,
  -- 定义输出参数
  output_parameter_name OUT datatype
)
AS
BEGIN
  -- 在这里编写你的查询代码
END;</code>

Step 3: Execute the stored procedure

<code class="oracle">EXECUTE stored_procedure_name (
  -- 传入输入参数
  input_parameter_value,
  -- 获取输出参数
  @output_parameter_name
);</code>

Example:

Create a stored procedure to query all customer information:

<code class="oracle">CREATE OR REPLACE PROCEDURE get_all_customers
AS
BEGIN
  SELECT * FROM customers;
END;</code>

Execute the stored procedure:

<code class="oracle">EXECUTE get_all_customers();</code>

Other notes:

• The query code in the stored procedure is similar to the ordinary SQL query.
• Stored procedures can be called by other queries or stored procedures.
• Use input parameters to dynamically pass query conditions.
• Output parameters can be used to store query results.

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