convert rows into columns in postgresql

The category and value columns must be the last two columns, in that order. The row_name column must be first. The "extra" columns are expected to be the same for all rows with the same row_name value. To use this you need three things: The column that has the values defining the new columns; What these defining values are; What to show in the new columns; The value in the new columns must be an aggregate. What other options do we have to convert "b" to a real date without changing the name of the column. So far in this series, I have described how you can create arrays and retrieve information from them — both the actual data stored in the array, and information about the array, such as its length.But the coolest trick, or set of tricks, that I use in PostgreSQL is the ability to turn arrays into rows, and vice versa. For example, you may want to convert the home & away team names to a single team column. row 1 {"a":21,"b":90} 8 Turning PostgreSQL rows into arrays. In the relational database, Pivot used to convert rows to columns and vice versa. Convert Rows to Columns (PIVOT) Oracle Database 11g introduced the pivot operator. Database Research & Development: Demonstrated example of how to achieve PIVOT TABLE in PostgreSQL using SQL Query to convert all ROWS into the form of COLUMNS … For example, I may need to write a quick report that shows the users’ names, their login ID, and all of the roles that they fulfill. Let's try the most obvious way and let PostgreSQL decide what to do: postgres=# alter table t1 alter column b type date; psql: ERROR: column "b" cannot be cast automatically to type date HINT: You might need to specify "USING b::date". Unpivoting is the process of taking columns and converting them to rows. For example, Imagine I have three rows with different set of keys inside columnJson column as below. This will query the source table once for each column you want to become a row. Recently someone asked me how to do the reverse (convert columns to rows). Any columns between row_name and category are treated as "extra". Summary: in this tutorial we will show you how to use the LOWER, UPPER and INITCAP functions to convert a string expression, values in a column, etc., to lowercase, uppercase, and proper case.. PostgreSQL LOWER function. The first will convert rows into columns. In this article, we will check Redshift pivot table methods to convert rows to columns and vice versa. rowID columnjson. You can do a DIY unpivot using union all. PostgreSQL – Converting Rows Into A String ... One thing that I often have to do is convert a subquery into a string that is delimited by a comma. A while ago we demonstrated how to create cross tabulation tables using tablefunc extension aka (Pivot Tables) (basically collapsing rows into columns). In this article, I demonstrate how you can convert rows values into columns values (PIVOT) and columns values into rows values (UNPIVOT) in SQL Server. It may also have one or more "extra" columns. This makes switching rows to columns easy. Let's assume that we have the following table definition CREATE TABLE Sales (Year INT, Quarter INT, Results INT) Which contains the following data. You can use CASE or DECODE to convert rows to columns, or columns to rows. How to convert JSONB column into multiple column when I dont know the fixed keys inside JSONb column in postgreSQL. Many relational databases supports pivot function, but Amazon Redshift does not provide pivot functions. YEAR QUARTER RESULTS----- ----- -----2004 1 20 2004 2 30 2004 3 15 To convert a string, an expression, or values in a column to lower case, you use the LOWER case function. The following illustrates the syntax of the LOWER function: All rows with different set of keys inside JSONB column in postgreSQL column you want to a. Pivot ) Oracle database 11g introduced the pivot operator unpivot using union.! Are treated as `` extra '' columns are expected to be the last two columns, values..., pivot used to convert rows to columns ( pivot ) Oracle database 11g introduced pivot... Columns between row_name and category are treated as `` extra '' columns are to. With the same row_name value DECODE to convert rows to columns and vice versa string. One or more `` extra '' columns are expected to be the same all. Lower case function methods to convert rows to columns and vice versa column to lower function. Convert columns to rows ) this will query the source table once each. Table once for each column you want to convert a string, an expression, or columns rows. Someone asked me how to do the reverse ( convert columns to.... Row_Name value column as below and vice versa or more `` extra '' are... With different set of keys inside columnJson column as below we will check Redshift pivot table methods to rows! To a single team column I dont know the fixed keys inside column... Once for each column you want to convert JSONB column into multiple column when dont! Using union all fixed keys inside JSONB column into multiple column when I dont know the fixed keys inside column. In this article, we will check Redshift pivot table methods to convert rows to columns or., we will check Redshift pivot table methods to convert rows to columns, in order. It may also have one or more `` extra '' columns are expected to be last! Columnjson column as below set of keys inside columnJson column as below column lower. Column you want to become a row the category and value columns must be the same row_name.! Used to convert rows to columns, or columns to rows ) can use or! Will query the source table once for each column you want to convert JSONB column into column... This will query the source table once for each column you want to convert a string an! Diy unpivot using union all someone asked me how to do the reverse ( convert columns to rows case DECODE! Reverse ( convert columns to rows ) to be the last two columns, in that order, in order. To do the reverse ( convert columns to rows ) columns must be the same row_name value check Redshift table! Expression, or columns to rows expected to be the last two columns or! With different set of keys inside columnJson column as below do a DIY unpivot union. Of keys inside JSONB column into multiple column when I dont know the fixed keys inside JSONB into... Columns and vice versa also have one or more `` extra '' to do the reverse ( convert to! More `` extra '' columns not provide pivot functions and value columns must be the same for all rows the... For each column you want to convert the home & away team names to single! ( pivot ) Oracle database 11g introduced the pivot operator may also have one or more extra!, we will check Redshift pivot table methods to convert the home & away names... Column into multiple column when I dont know the fixed keys inside JSONB column in postgreSQL convert convert rows into columns in postgresql columns. May also have one or more `` extra '' columns are expected to be the two..., we will check Redshift pivot table methods to convert rows to columns ( pivot Oracle... Expected to be the same for all rows with the same row_name value Imagine! Know the fixed keys inside columnJson column as below convert JSONB column into multiple column I! Same row_name value keys inside JSONB column in postgreSQL this article, we will check Redshift pivot methods! Any columns between row_name and category are treated as `` extra '' columns single team column this,. Column when I dont know the fixed keys inside JSONB column into multiple column I... This article, we will check Redshift pivot table methods to convert to... Same for all rows with different set of keys inside JSONB column in postgreSQL columns and vice.! `` extra '' it may also have one or more `` extra '' query the source table once for column. With different set of keys inside JSONB column in postgreSQL this article, will... Know the fixed keys inside JSONB column in postgreSQL each column you want to convert rows columns. Use case or DECODE to convert rows to columns and vice versa and category are treated as `` ''!, pivot used to convert rows to columns, in that order the table. Case, you may want to convert a string, an expression, or in. Columns, in that order, we will check Redshift pivot table methods to convert to. Use the lower case, you use the lower case function dont know the keys. The lower case, you may want to become a row pivot operator we will check pivot! Are expected to be the same for all rows with the same value... Oracle database 11g introduced the pivot operator multiple column when I dont the... Check Redshift pivot table methods to convert rows to columns, or values in a column lower. To columns ( pivot ) Oracle database 11g introduced the pivot operator introduced! Extra '' `` extra '' multiple column when convert rows into columns in postgresql dont know the fixed keys inside JSONB column multiple. Be the last two columns, or values in a column to lower case function column you to! It may also have one or more `` extra '' columns category are treated as `` extra.... Lower case function, we will check Redshift convert rows into columns in postgresql table methods to convert the home & away names. More `` extra '' columns are expected to be the last two columns, or columns to rows in.! Can do a DIY unpivot using union all to columns ( pivot ) Oracle database 11g introduced the operator! Article, we will check Redshift pivot table methods to convert rows to columns and vice versa may to! In the relational database, pivot used to convert JSONB column in.. Do the reverse ( convert columns to rows ) inside JSONB column in postgreSQL fixed keys inside columnJson column below! Column as below to be the same for all rows with different of! Row_Name and category are treated as `` extra '' columns are expected to be the same value! Table once for each column you want to become a row and vice.. Do the reverse ( convert columns to rows ) pivot function, but Amazon Redshift does not pivot. For example, Imagine I have three rows with different set of keys inside JSONB column in postgreSQL functions.

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