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To obtain SLA data from a PostgreSQL table through text comparison and value retrieval, follow these steps:

1. Identify the columns in the PostgreSQL table that contain the SLA data you are interested in. These may include columns such as 'Date/Time', 'Response Time', 'Availability Percentage', etc.

2. Write a SQL query that selects the relevant columns from the table. For example:

   SELECT "Date/Time", "Response Time", "Availability Percentage" FROM SLA_Table;

3. If you want to filter the results based on specific criteria, add a WHERE clause to the query. For example, to retrieve SLA data for a specific day, you could use:

   SELECT "Date/Time", "Response Time", "Availability Percentage" FROM SLA_Table WHERE "Date/Time" = '2022-10-15';

4. To compare text values in the SLA data, you can use the LIKE operator in your SQL query. For example, to retrieve SLA data for a specific application, you could use:

   SELECT "Date/Time", "Response Time", "Availability Percentage" FROM SLA_Table WHERE "Application Name" LIKE '%MyApp%';

5. To retrieve specific values from the SLA data, you can use the appropriate SQL function for the data type. For example, to retrieve the average response time for a certain period, you could use:

   SELECT AVG("Response Time") FROM SLA_Table WHERE "Date/Time" BETWEEN '2022-10-01' AND '2022-10-31';

By combining these techniques, you can retrieve SLA data from your PostgreSQL table based on text comparison and value retrieval.